How to Store Emergency Water at Home | The 6-Month Rule

That covers drinking and basic hygiene, and it applies to every household regardless of size. The unglamorous secret is that the storage method matters as much as the quantity.

What Is The Right Container For Storing Water?

Food-grade containers are the gold standard, and the CDC says to use one if you can. If a dedicated food-grade container isn’t available, look for a durable, unbreakable option with a tight lid and a narrow neck—the design limits contamination. The San Francisco Public Utilities Commission notes that clean 2-liter soft drink bottles are a solid, widely available alternative. Avoid glass entirely; it breaks, and it doesn’t survive the conditions a real emergency creates.

Skip anything that previously held milk, juice, or toxic substances. Milk residue is nearly impossible to fully remove and breeds bacteria in stored water. Containers that held gasoline, pesticides, or cleaners are disqualified outright—the chemicals soak into the plastic and leach back out into your drinking water.

How To Fill And Sanitize Your Containers

Clean containers first, then sanitize, then fill. The CDC’s procedure is straightforward:

1. Wash the container with soap and water, then rinse it completely.
2. Mix a sanitizing solution of 1 teaspoon unscented liquid household chlorine bleach per 1 quart (4 cups) of water.
3. Pour the solution into the container, cover it tightly, and shake well so it coats every interior surface.
5. Fill the container with clean tap water, cap it tightly, and label it “drinking water” with the storage date.

When the container is full and sealed, your job is done—until the six-month mark rolls around. That label with the date is the only thing standing between you and accidentally drinking water that’s sat too long, so write it clearly and check it when you change the clocks.

Bottled Water: A Solid Shortcut With One Catch

Commercial bottled water is perfectly acceptable, according to the SFPUC, with a single caveat: if the bottle’s seal is broken, don’t store it long-term. An unopened bottle keeps its integrity for years; a partially used one invites the same bacterial growth you’re trying to avoid. For a quick, grab-and-go supply, bottled water is the lowest-effort option.

Whether you fill your own containers or stock bottled water, label everything with a date and rotate it.

Where To Store Water And How Much You Need

The CDC’s minimum is 1 gallon per person per day—enough for drinking and basic sanitation. The SFPUC recommends planning for a 3-5 day supply, which means a family of four should aim for 12 to 20 gallons on hand. That sounds like a lot until you realize two 5-gallon jugs per person covers the low end.

Sunlight and heat degrade both the water and the plastic over time. Store water under beds, in cabinets, in closets, or even in a garage, so long as it stays away from gasoline, pesticides, herbicides, and any source of strong odor. The CDC also recommends spreading your supply across multiple locations, so a single damaged room or spilled chemical doesn’t eliminate your entire stash.

For a tested lineup of containers that handle the six-month cycle well, our roundup of emergency water storage options covers the durable, food-grade picks worth the money.

The CDC’s official guidance on creating an emergency water supply confirms the full procedure, and the SFPUC’s storing and treating water page backs the 3-5 day planning horizon.