One gallon per person per day is the federal baseline. Almost no household stores two weeks of it, and the reason is usually weight rather than willingness.
How much water does a household actually need?
One gallon per person per day for drinking and sanitation, which Ready.gov gives as the planning figure. For four people over fourteen days that is 56 gallons.
Fifty six gallons weighs roughly 470 pounds and occupies about as much floor as a small refrigerator. This is the point where most plans quietly become aspirational. The honest approach is to store what you can physically manage, know two treatment methods for the rest, and count the water already in the house before deciding you have failed.
Pets add to it. A medium dog drinks roughly half a gallon a day and nobody remembers to include them.
Store water in containers you can lift
A full five gallon jug weighs about forty pounds. If the person who has to carry it cannot, that water does not exist.
- One gallon jugs are underrated. Eight pounds each, stackable, and anyone in the house can move one.
- Commercial bottled water rotates itself if you drink it, which is the only rotation scheme that survives contact with real life.
- Food grade containers only. A container that held anything other than food is not a water container, whatever it has been rinsed with.
- Fill the freezer gaps with water. It is thermal mass during an outage and drinking water afterwards, which is covered in how long a home freezer really holds without power.
Expert note from Renata Sowell, water and evacuation editor
Store some of it low and some of it high. I have been in houses where every drop was on a garage shelf at shoulder height, and after the flood it was all still there, perfectly clean, and completely unreachable because the garage was under four feet of water. Split the store between floors.
What does the water heater actually hold?
Thirty to fifty gallons in most American homes, already treated, already in the house, and almost always forgotten.
It is the single largest reserve most households own. To use it, shut off the incoming supply so nothing contaminated is drawn in, turn off the heater’s power or gas, open a hot tap upstairs to break the vacuum, and draw from the drain valve at the bottom. The first pull will be cloudy with sediment. That is normal and it settles.
- Shut the incoming supply first. Otherwise you draw contaminated mains water into the tank you were trying to protect.
- Kill the power or gas to the heater before draining, or the element fires into an empty tank.
- Open a hot tap upstairs to break the vacuum, or almost nothing will come out of the drain valve.
- Expect sediment in the first gallon. It settles, and it is not a reason to discard the rest.
Think of it the way you would think of a fuel tank you have never checked. The capacity was there the whole time, and the only thing standing between you and it is knowing which valve to turn.
Which treatment method should you keep?
Keep one physical method and one chemical method, not two of either. They fail in different ways, which is the entire point.
| Method | What it removes | What it does not | Time | Where it fits |
|---|---|---|---|---|
| Rolling boil | Bacteria, viruses, protozoa | Chemicals, heavy metals, salt | 1 minute, 3 above 5,000 ft | Best method whenever you have fuel |
| Unscented household bleach | Bacteria, most viruses | Cryptosporidium, chemicals | 30 minutes standing | Cheap, shelf stable, needs fresh bleach |
| Filter, 0.2 micron or finer | Bacteria, protozoa, sediment | Viruses, dissolved chemicals | Immediate | Cloudy water, and volume |
| Iodine tincture, 2 percent | Bacteria, most viruses | Cryptosporidium | 30 minutes | Backup only, not for pregnancy or thyroid conditions |
| Tablets | Varies by product | Read the label, they differ | 30 minutes to 4 hours | Small, sealed, good in a bag |
The trade is straightforward. Boiling is the most reliable and costs fuel you may want for cooking. Bleach costs almost nothing and expires, which people forget: liquid chlorine bleach loses strength within about a year at room temperature, so the bottle in the kit needs replacing on the same schedule as the batteries.
What to do the hour a boil notice arrives
Stop drinking from the tap, including ice and the coffee machine, then work through the house in order.
- Turn off the ice maker and throw out the ice already made. It is the most commonly missed item.
- Fill containers from the tap anyway, and treat that water. Cloudy is fine, untreated is not.
- Boil for one minute at a rolling boil, or three minutes above five thousand feet.
- Use treated water for brushing teeth and washing dishes as well as for drinking, which is the part households skip on day three.
During one coastal notice a household in our county did everything right for five days and then got sick anyway, because they had kept refilling the dog’s bowl from the tap and the toddler drank from it. The notice covers every mouth in the building, and that is the sentence worth repeating out loud to everyone present.
Expert note from Dan Brackett, founder and former distribution lineman
Keep the bleach separate from the cleaning cupboard and label it. Scented, colour safe and splashless bleach will not disinfect drinking water, and under pressure everybody grabs the wrong bottle. Plain, unscented, and check the date on it twice a year.
How this fits with the rest of the pantry is covered in building two weeks of food you will actually eat, and the rest of our material sits under food and water storage.