A healthy human being can survive between 3-5 days without water, depending on their environment. Most people do not adequately account for their water usage when beginning their emergency preparations. Sources suggest you should have at least one gallon of water, per person, per day. Be ready for any emergency or natural disaster. Stock your home and office with an adequate supply of drinking water in appropriate containers, including water filters and purifiers, and have peace of mind that you are prepared for any event.