55-Gallon water barrel is one of the easiest and most effective ways to store water for long term. A person can live for weeks without food, but without water your body can be significantly damaged in a matter of days. That is why, in an emergency, water may be the most important supply to have available. Each 55-gallon barrel provides enough water for drinking, cooking, and light personal sanitation for 4 people. The dark blue color of this 55 gallon barrel restricts light and helps control growth of harmful algae and bacteria.