That depends. In a hot, humid climate the body looses more fluid and will dehydrate faster. If the person is too cold the body will burn more energy and dehydrate faster. If the person consumes a lot of food, or a lot of sodium, if the person is sick, if the person is physically active, if the person drools a lot - these all affect the outcome. BUT, under IDEAL conditions, the human body can survive with only 2 ounces of water per day.
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