Food & Water
Bathtub water storage: fill it before the storm
Fill the tub, the pots and the bottles before the storm, and label drinking water apart from wash water. Here is the pre-storm checklist for a well-and-pump home.
On this page (11 sections)
- Emergency bathtub water storage: what the filled tub is actually for
- The pre-storm fill checklist
- How much water three days actually takes
- Water storage in containers you already own
- Label what is drinking water and what is wash water
- Treating stored tap water with bleach, and when you have to
- If something goes wrong
- When to get help
- Frequently asked questions
- Keep going
- Sources
Your water comes out of a well and into the house on an electric pump, so a winter storm doesn't just take the lights — it takes the tap. No filling the kids' bottles, no flushing, nothing to cook with, and every alert since has set off the same thought: why is there nothing stored? Bathtub water storage is the fastest reserve you can build, and the hours before a storm are the only window you get to build it.
What follows is a pre-storm fill checklist for a well-and-pump house: what to scrub and fill, which containers you already own are actually safe for drinking water, how much three days takes, how to label drinking water apart from wash water, and how to treat what you store. There is no generator in this plan and nothing to buy first — a brush, your own pots and a bottle of plain unscented bleach do most of the work.
Key takeaways
- Fill before the storm, while the pump still has power: the tub, every lidded pot and pitcher, cleaned soda bottles, and a plan for the hot water heater.
- Tub water is wash water. Tubs and sinks are hard to sanitize, so water stored in them is not recommended for drinking or cooking unless it is treated first (Virginia Cooperative Extension).
- Well water is not treated water: boil it for one minute at a rolling boil, three minutes above 5,000 feet, or disinfect it with unscented 5.25%–6% bleach at 8 drops per gallon (U.S. EPA).
- Plan at least one gallon per person and per pet per day for at least three days, with at least two quarts a day of that for drinking (Virginia Cooperative Extension).
- Cleaned two-liter soda bottles can be reused for water; milk jugs can't (Oregon State University Extension Service).
- Label every container DRINKING or WASH, with the date, on the day you fill it.
Things this guide mentions
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Emergency bathtub water storage: what the filled tub is actually for
A full tub is the biggest container in the house and it comes with the most caveats. Virginia Cooperative Extension is direct about it: because tubs and sinks are hard to sanitize, water stored in them is not recommended for drinking and cooking unless it is treated first, and it is best used for bathing, washing and pets.
So plan the tub as wash water — flushing, sponge baths, rinsing dishes, handwashing, pet bowls — and put drinking water in lidded pots, bottles and the hot water heater. Two hard lines from the same guidance: never use water from toilet tanks or bowls, or from a swimming pool, for drinking or cooking.
| Where the water is | Good for | Not for |
|---|---|---|
| Scrubbed tub, filled before the storm | Flushing, washing, sponge baths, pet bowls | Drinking or cooking unless treated first |
| Lidded pots, pitchers and cleaned bottles | Drinking, cooking, brushing teeth, ice | Anything that puts dirty hands or cups in it |
| Hot water heater | Drinking and cooking while that water is still fresh | Drinking after days in the tank without treating it |
| Toilet tank or bowl, swimming pool | Nothing you would use for people | Drinking or cooking |
That split is the whole idea behind water storage for a bathtub: one big, easy container for the water you only wash in, and a smaller, cleaner set of containers for the water people drink. Decide which is which before you start filling, because in a dark bathroom on day two, everything looks the same.
The pre-storm fill checklist
Work through this while the forecast is still a forecast. Once the pump is off, the only water you have is what you already put in a container.
Scrub the tub, then start filling it
Hot water and dish detergent, a sponge or a brush on a handle, then rinse until the water runs clear and no soap film is left. You are not trying to sterilize a bathtub — that is the part you cannot reliably do, which is exactly why this water is for washing. You are removing soap scum, hair and whatever the dog tracked in.
Stop a few inches below the rim so it doesn't slosh when a child leans over the edge, and keep the bathroom door shut so pets stay out.
Done when: the tub is full and a note taped on the tile above it says WASH ONLY, with the date.
Wash and air-dry every bottle, pot and pitcher
Hot water and dish detergent, a bottle brush for anything narrow, then rinse until no suds remain and stand the containers upside down on a clean towel. Don't skip the drying: a container capped while still wet inside is where stored water starts to taste wrong.
Done when: every container is dry inside and stacked somewhere clean.
Fill them and store them cool and dark
Lidded pots, pitchers, jars and cleaned two-liter bottles all work (the container table below sorts them out). Fill to the top, cover, and keep them in a cool, dark place — a lower kitchen cabinet beats a sunny windowsill. If your freezer has empty space, fill food-grade containers with water, freeze them, then cap them: they hold the cold longer during an outage and become drinking water as they melt (Oregon State University Extension Service).
Done when: every lidded container and bottle is full, capped and indoors.
Know how you'd draw water from the hot water heater
In a well-and-pump house the tank is often the largest clean supply left after the pump stops. Virginia Cooperative Extension's steps: turn off the gas or electricity to the tank so the heating unit cannot come on while it is emptying, close the shut-off valve at the top, open a hot water faucet in the house to let air in, then rinse the drain valve at the bottom by running a little water into a container and throwing that first rinse away. Draw what you need from the valve, use caution drinking it while it is still hot, and refill the tank before you turn the heat back on. Water sitting in the plumbing stays safe for only a few days before it needs purifying.
Done when: you have read the steps out loud to another adult and know where the valve is.
Find your main shut-off
If officials warn that the water is unsafe, or you see signs of broken water lines, Extension guidance is to shut off the water lines entering the home so contaminated water cannot work its way into your plumbing. Find that valve now, in daylight, and know which way it turns — a shut-off you have never touched is a guess when the lights are out.
Done when: you can point to the valve and explain to another adult in the house how to close it.
How much water three days actually takes
Virginia Cooperative Extension's starting point is at least one gallon of water per person and per pet per day, with a three-day supply as the minimum. Plan on at least two quarts of drinking water per person per day, and more if someone is pregnant, sick or very young.
That gallon covers more than drinking. Potable water is also what you brush teeth with, cook with and wash dishes in — and if your emergency food is dehydrated, it takes extra water to prepare, which is easy to forget while you are counting bottles.
A household of four with one dog, planning three days at one gallon each per day, needs about 15 gallons: four people plus the dog, times three days. A two-liter bottle holds a bit over half a gallon, so one bottle per person per day covers the two-quart drinking minimum — a dozen bottles for a family of four, before the lidded pots and the hot water heater. The tub doesn't count toward that number. It is the wash water.
Sizes, rotation and long-term storage are in emergency water storage, and if the reason you are reading this is a pump that quits when the power does, does a power outage affect water walks through the first three days.
Water storage in containers you already own
You do not need to buy anything to get through three days. The question is which containers in your kitchen and recycling bin are actually safe, and the answer is more specific than "plastic is fine."
| Container | Store drinking water in it? | What to know |
|---|---|---|
| Two-liter soda bottles | Yes, after cleaning | Extension says they can be cleaned and reused; keep them cool, dark and dry, given the concern about food in plastic above 95 °F (35 °C) |
| Milk jugs | No | The plastic is designed to biodegrade over time so they leak, and milk protein left behind can spoil the water |
| Lidded pots, pitchers and bowls | Yes, for short-term use | Clean, fill, cover, keep cool and dark; usually good for a few days, about a week if you can keep them cold |
| Food-grade buckets and jugs with tight lids | Yes | Fill clean, food-grade containers with tight covers and store them cool and dark (Oregon State University Extension Service) |
| Commercially bottled water | Yes | Replace it every six months for quality (Oregon State University Extension Service) |
| Totes, coolers and bins not rated for food | No — wash water only | Fine for flushing and rinsing, never for anything you swallow |
If you would rather have one purpose-made container than a shelf of bottles, a food-grade jug with a tight lid is the item to look for. It is optional: a cupboard of cleaned soda bottles does the same job.
Search food-grade water storage containers on Amazon (Amazon, affiliate link) opens in a new tab
Container shopping in more detail, including what the recycle code does and does not tell you, is in how to choose water storage containers.
Why there is no gear list on this page
You have seen preparedness pages that turned out to be a funnel for an expensive generator and a bucket of food your kids won't eat. This one needs a scrub brush, your pots and plain unscented bleach. Where the site links to shopping it is a labeled Amazon search link for an item type — never a product pick, a price or a claim that something works. The canning guides follow tested USDA and National Center for Home Food Preservation methods, not blog opinion, and every page lists its sources so you can open them. No food-safety professional reviews these guides, as how we write explains, so the citations are the check you can run yourself.
Label what is drinking water and what is wash water
In a dark kitchen on day two of an outage, everything in a pot looks the same. Labeling is a two-minute job that prevents the mistake you are actually worried about: someone filling a kettle from the tub because it was the closest water.
- Write DRINKING or WASH on each container in marker or on masking tape, with the date you filled it.
- Tape a WASH ONLY note to the tile above the tub, at eye level, where anyone standing there will see it.
- Keep one cup or ladle with the drinking water and nothing else — no dipping in a cup that has been in someone's mouth.
- Put all the drinking water in one place, away from cleaning supplies, fertilizer and anything with a strong odor, since those smells can be absorbed by the container and carried into the water (Oregon State University Extension Service).
- Keep the bleach bottle out of the drinking-water cupboard so nobody mistakes it for a beverage in the dark.
An outage is also when people start filling odd containers and trading water with neighbors. If someone hands you a topped-up jug, ask what was in it before you drink from it.
Treating stored tap water with bleach, and when you have to
Start with the shortcut. If your water comes from a city or town system, Oregon State University Extension Service notes it is already treated to be safe, so no additional treatment is needed before storage. Water from a well or spring, even one you trust, should be purified before anyone drinks it.
Boiling is the most reliable method, and the Environmental Protection Agency's instruction is short: bring the water to a rolling boil for at least one minute, and for three minutes above 5,000 feet. Let it cool before you store or drink it. Disinfecting with bleach works too, and the dose depends on the strength printed on the bottle.
| Bleach in the bottle | Dose | Then |
|---|---|---|
| Unscented household chlorine bleach, 5.25%–6% sodium hypochlorite, the only active ingredient | 8 drops (1/8 teaspoon) per gallon of water | Stir and let it stand 30 minutes |
| Same bleach, but the water is cloudy after filtering or settling | 16 drops (1/4 teaspoon) per gallon of water | Stir and let it stand 30 minutes |
| No slight chlorine smell after 30 minutes | Repeat the same dose | Wait 15 more minutes, then use it |
Those are EPA's figures, and they are written for plain unscented household bleach at 5.25%–6% sodium hypochlorite with nothing else in the bottle: no scent, no splashless, no color-safe, no added cleaner. Concentrated 8.25% bleach is a stronger product, and published doses for it differ between sources. Don't scale EPA's figure yourself. If 8.25% is what's in the cupboard, use it only with the dilution your local health department publishes, or buy a plain 5.25%–6% bottle so the EPA dose applies exactly as printed.
Cloudy water gets two steps, not one: EPA's instructions are to filter it through clean cloths, or let it settle and pour off the clear water, and then disinfect — and if it is still cloudy, the dose doubles to 16 drops per gallon. Scale matters too. Treat water a quart or a gallon at a time in a jug or stockpot, rather than pouring bleach into a full bathtub and hoping it mixes; a dose you cannot measure and stir is not a dose.
Search unscented household liquid bleach on Amazon (Amazon, affiliate link) opens in a new tab
And if your system is under a boil water notice right now, the notice comes first. The dose here does not override it. What to boil, bottle and skip covers what changes, and the bleach dose chart has the full set of figures.
If you are boiling water on a camp stove
Boil outdoors. Never indoors, never in a garage even with the door open, never in a basement or crawl space — carbon monoxide kills people doing exactly this during outages. Install battery-powered carbon monoxide alarms on each level of the home and near sleeping areas (CDC). If an alarm sounds, get everyone outside first and call 911 from outdoors.
Generators follow the same rules and belong at least 20 feet (6 m) from doors, windows and vents (CDC). Never connect a generator to your home's wiring without a transfer switch installed by a licensed electrician — backfeed can kill a utility worker.
If something goes wrong
- If the tub water has hair, soap film or dust floating in it
- It is wash water, and it was always going to be. Skim what you can with a clean cup and leave it for flushing and rinsing. Don't strain it and call it drinking water.
- If a reused bottle still smells after washing
- Recycle it. A smell you can't place is the one thing you can't check at home, and you have other containers.
- If someone says the stored water tastes flat
- Pour it back and forth between two clean containers a few times to put air back in it (Oregon State University Extension Service). Flat is a taste problem, not a safety problem.
- If the power is already out and the tub is empty
- Draw from the hot water heater first — that water is already in the house — and treat the empty tub as a loss. From here on, water comes from the heater, from the containers you filled, or from a container brought from somewhere else; the pump won't refill that tub until the power is back. Work by flashlight, not by an open flame near anything that can tip.
- If the storm misses you
- Use the stored water on plants, for cleaning or for the dog, then refill. Extension guidance is to replace water in your own containers every six months; a tub gets dumped and scrubbed once the tap is back.
When to get help
Call for help if
- Anyone gets stomach cramps, vomiting or diarrhea after drinking stored water, or shows signs of dehydration: call a health care provider, or 911 if it is serious.
- A carbon monoxide alarm sounds while you are boiling water on a camp stove or grill: get everyone outside first, then call 911 from outdoors. Cook and boil outdoors only — never in a kitchen, garage, basement or crawl space (CDC).
- Your well was flooded, or the casing or pump was damaged in the storm: follow your local or state health department's guidance on a flooded well before you drink from it again.
- The notice for your water system says not to use the water for anything at all: follow it exactly and call the number on the notice before you use a drop.
Who to ask. In an emergency, call 911. If a carbon monoxide alarm sounds or anyone feels dizzy, sick or confused, get everyone outside into fresh air first, then call 911. Report outages and downed power lines to your utility. For local hazards, shelters and alerts, contact your city or county emergency management office (start at Ready.gov).
Frequently asked questions
Is storing water in a bathtub safe to drink?
Not straight from the tub. Virginia Cooperative Extension notes that tubs and sinks are hard to sanitize, so water stored in them is not recommended for drinking or cooking unless it is treated first. If you must drink it, work in small batches: a full rolling boil for one minute (three minutes above 5,000 feet), or EPA's chlorine dose for that quantity with a 30-minute wait.
How long does water storage in a bathtub last?
Treat a filled tub as an outage supply, not a stash. Extension guidance is that water in tubs and sinks is best used for washing and pets, and the tub gets dumped and scrubbed once your tap is back. The "few days, about a week if you keep it cold" figure applies to short-term storage in covered containers kept cool and dark, not to water standing in an open tub.
What is the best water storage for a bathtub fill, if the tub is only for washing?
Whatever you already own that is clean, covered and food-safe: lidded pots and pitchers, cleaned two-liter soda bottles, and food-grade jugs or buckets with tight lids. Milk jugs are out — the plastic is designed to break down and leak, and milk protein can spoil the water. Anything not rated for food is for wash water only.
Do I need to treat well water before storing it?
Yes. City water is already treated to be safe, but water from a well or spring should be purified by boiling or with unscented household bleach before anyone drinks it. Boiling is the safest method: a rolling boil for one minute, three minutes above 5,000 feet (EPA), then let it cool before you store or drink it. Chlorine doses are in the table above.
How do I clean a bathtub before filling it for water storage?
Hot water and dish detergent, a sponge or a long-handled brush, then rinse until the water runs clear and no soap film remains. The goal is a clean tub, not a sterile one — you cannot reliably sanitize a tub, which is why that water is labeled WASH and kept for flushing, washing and pets rather than drinking.
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Sources
- Emergency Disinfection of Drinking Water, U.S. Environmental Protection Agency (accessed November 2, 2026).
- Carbon Monoxide (CO) Poisoning Basics, Centers for Disease Control and Prevention (accessed November 2, 2026).
- Emergency Water Supply Preparation (BSE-209), Virginia Cooperative Extension (accessed November 2, 2026).
- Survival Basics: Water (EM 9285), Oregon State University Extension Service (accessed November 2, 2026).
- Soda bottles for emergency water storage?, Oregon State University Extension Service (accessed November 2, 2026).
Water storage, in the right order
The Food and Water section puts storing, treating and rotating water in order, with the bleach dose chart and the boil-water guide next to it.