When faced with a survival situation, clean drinkable water is often the most important consideration. People have survived without food for weeks or even months, but go without water for even just one day and the survivor will be in desperate straights indeed.
Knowing that water is by far the most important nutrient for the human body (besides oxygen) and, in particular, during a survival situation when finding potable water may not be easy, the question becomes – just how long can the human body survive without adequate water?
To maintain a high level of health and efficiency even in ideal environments, a minimum of two quarts of clean water per day per person is the generally accepted rule of thumb. In very hot or cold or very dry environments, or if you are physically active, two quarts of water a day may not be enough to sustain life over a period of days or weeks.
Water lost through sweating and normal respiration must be replaced in order to stay healthy and function at top efficiency. Water is also needed to process the food you eat, especially if it is salty or you eat heavy foods like meat
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