Storm-Season Water Prep: How Much to Store, and How to Keep It Safe

The federal planning number is one gallon of water per person per day, and while a basic disaster kit is built around a three-day supply, Ready.gov's own guidance is to consider storing at least a two-week supply for each member of your household. That gallon is not all drinking — it covers drinking and sanitation, which is the line most people forget until the tap is off and they need to wash their hands. If you live somewhere that gets hurricanes, and it is late August, this is the week to do the arithmetic rather than the week after a cone appears on the map.

Doing the math for your actual household

Four people times one gallon times three days is 12 gallons for the minimum kit; the same household at two weeks is 56 gallons. Then adjust, because the federal guidance is explicit that individual needs vary with age, health, physical condition, activity, diet, and climate. Children, nursing mothers, and people who are ill may need more. A medical situation may require substantially more. In very hot weather, needs can double — and a September storm in the Southeast frequently means no power, no air conditioning, and a house that gets hot fast. Do not forget pets, and do not forget that anything you plan to cook adds to the total.

Why the water goes out when the storm does

It is rarely a supply problem. A public system relies on pressure and on treatment running continuously. Lose power at a pump station, break a main under a fallen tree, or flood a treatment plant, and pressure drops. When pressure drops, groundwater and whatever it is carrying can be drawn into the pipes through joints and cracks — which is exactly why utilities issue a precautionary boil-water advisory after a main break, a hurricane, or a flood, often before any test has come back positive. The advisory is not an announcement that the water is contaminated. It is an announcement that they cannot currently guarantee it is not.

What a boil-water advisory actually asks of you

The CDC's instruction is specific and short: bring water to a full rolling boil for one minute — three minutes above 6,500 feet elevation — then let it cool before use. If the water is cloudy, filter it first through a clean cloth, paper towel, or coffee filter, then boil. Use bottled, boiled, or treated water for drinking, cooking, brushing teeth, making ice, and washing food. If boiling is not possible, CDC and Ready.gov describe disinfecting with unscented household bleach — on the order of an eighth of a teaspoon per gallon of clear water, stirred and left to stand 30 minutes, with a slight bleach odor as the sign it worked. And the point worth internalizing before you need it: boiling and chlorination kill germs, but they do not remove chemical contamination. If the advisory concerns a chemical spill rather than microbes, boiling is the wrong tool and the instructions will say so. Follow your health department's specific wording.

Storing water so it is still good in October

A few practical rules. Use food-grade containers, keep them somewhere cool and out of direct sunlight, and label them with the date. Do not reuse containers that held milk or juice — the residual sugars and proteins are difficult to fully remove. Commercially bottled water should be left sealed and rotated by its own date. If you are storing tap water yourself, rotate it on a schedule you will actually keep, which for most people means twice a year on some memorable date. Fill your bathtub and every large pot when a storm is forecast; that water is fine for flushing and washing even if you would rather not drink it.

The last-24-hours checklist

When a storm is genuinely coming: fill every insulated bottle you own with cold water and put a couple in the freezer, which does double duty as ice for a cooler and as cold drinking water later. Charge everything. Move the emergency water somewhere you can reach in the dark. And put a full bottle in each vehicle — evacuation traffic is the scenario where a car with no water becomes a genuine problem rather than an inconvenience.

Bottles that earn their place in a kit

An insulated stainless bottle is a useful piece of storm gear specifically because it keeps water cold for a long time with no power involved. The NuRich 32 oz Insulated Water Bottle ($29.99) is the one to fill and freeze before the power goes out, and the NuRich 18 oz Insulated Water Bottle — The Original ($14.99) is the size that lives in a go-bag or a glove box without taking over. Neither replaces stored gallons — they are what makes the stored water usable and cold. See the full lineup at the NuRich collection.

This article is general preparedness information. In an actual emergency, follow the instructions issued by your local water utility, health department, and emergency management agency — their guidance is specific to the event and overrides anything written here in advance.

Sources: Ready.gov, "Water" and "Build A Kit" (ready.gov/water; ready.gov/kit — store at least one gallon per person per day for several days for drinking and sanitation; three-day supply for a basic kit and consideration of a two-week supply at home; needs vary with age, health, activity, diet and climate, and can double in very hot temperatures; disinfection with unscented household bleach); CDC, "How to Make Water Safe in an Emergency" and "Drinking Water Advisories: An Overview" (cdc.gov/water-emergency — bring clear water to a full rolling boil for 1 minute, 3 minutes above 6,500 feet; filter cloudy water through a clean cloth, paper towel or coffee filter first; use bottled, boiled or treated water after a water main break, hurricane or flood, following health department recommendations). NuRich product information.