The CDC has provided guidelines and considerations for preparing a safe and healthy water supply at home in preparation for outbreaks and emergencies. Ensure your emergency water supply is created safely and stored properly because, during a water-related emergency or outbreak, safe drinking water may not be available. Prepare for an emergency by creating and storing a supply of water that will meet your family’s needs (https://www.cdc.gov/healthywater/emergency/creating-storing-emergency-water-supply.html):
Bottled Water 
Unopened, commercially bottled water is the safest and most reliable source of water in an emergency. If you do not have bottled water, you can make your water safe to drink by following the instructions on CDC’s Making Water Safe in an Emergency page and using clean containers to collect and store your water.
How Much Emergency Water to Store
- Store at least 1 gallon of water per person per day for 3 days for drinking and sanitation.
Try to store a 2-week supply if possible. - Consider storing more water than this for pregnant women, people who are sick, pets, or if living in a hot climate.
Other Considerations
- Observe the expiration date for store-bought water.
- If you are filling containers with water to store, replace the water every 6 months.
- Store a bottle of unscented liquid household chlorine bleach (the label should say it contains between 5% and 9% of sodium hypochlorite) to disinfect your water, if necessary, and to use for general cleaning and sanitizing.
Choosing a Container
If you are filling containers with water to store, it is best to use food-grade water storage containers. FDA-approved food-grade storage containers will not transfer toxic substances into the water. They can be found at surplus or camping supply stores. Contact the storage container manufacturer if you are not sure whether the container is food-grade. If you are not able to use a food-grade water storage container, be sure the container you choose:
- Has a top that can be closed tightly.
- Is made of durable, unbreakable materials (not glass).
- Has a narrow neck or opening, if possible, so water can be poured out.
DO NOT USE containers that were previously used to hold liquid or solid toxic chemicals, such as bleach or pesticides.
Cleaning and Sanitizing a Water Storage Container Before Use
Before filling with water, follow these steps to clean and sanitize water storage containers:
- Wash the storage container with soap and rinse completely with water.
- Sanitize the container with a solution made by mixing 1 teaspoon of unscented liquid household chlorine bleach in 1 quart (4 cups) of water. Use bleach that contains 5%–9% sodium hypochlorite.
- Cover the container tightly and shake it well. Make sure the sanitizing bleach solution touches all inside surfaces of the container.
- Wait at least 30 seconds and then pour the sanitizing solution out of the container.
- Let the empty container air-dry before use.
- Pour clean water into the sanitized container and cover it with a tight lid.
Storing the Water
Tips for storing water from your home:
- Label container as “drinking water” and include storage date.
- Replace water every six months.
- Keep containers in a place with a cool temperature (50°F –70°F).
- Keep containers away from direct sunlight.
- Keep containers away from areas where toxic substances, such as gasoline or pesticides, are present.
Learn more about Healthy Water, Water, Sanitation, & Hygiene (WASH)-related Emergencies & Outbreaks, and Preparing a Home Water Supply from the Centers for Disease Control and Prevention (CDC).