Water makes up at least 60% of an adult's body. Not a single body cell can function without it. Every day, some amount of water leaves the body through urine, sweat, and exhaled breath. If you don't replenish the loss, this will lead to a decrease in blood volume (as blood is 90% water).
In turn, this will cause low blood pressure and cause your body to stop sweating.
Since sweating is the mechanism your body has against overheating, body temperature will start going up until it reaches a critical point.
People endure lack of water differently under different conditions.
A healthy person may last without water for about a week in cool weather, although in most cases, it is likely to be about 3-4 days.
Under extreme circumstances (heat or excessive exercise), the body loses 0.3-0.4 gal (1-1.5 l_ of sweat per hour. Without replenishing the lost fluid, a person may die within a few hours.
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