If you are storing water for food storage, you need to use preventative measures to keep your water safe to drink. To prevent the growth or microorganisms during water storage use:
8 drops of bleach to 1 gallon of water
1 teaspoon of bleach for every 5 gallons of water.
If you are trying to kill microorganisms or if your water is already cloudy:
16 drops of bleach to 1 gallon of water
2 teaspoons of bleach for every 5 gallons of water stored.
Unscented household bleach with 5% chlorine is recommended.