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Originally Posted by Big Dad
Man that was long winded...I feel thirsty again.
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Big Dad,
A daily intake of 3-6 liters of water is required for the normal physiological functioning of the human body, depending on ambient weather conditions and diet (especially salt and sugar intake). The absolute minimum over the long term is about 1.6 liters (600 ml for urine, 200 ml for fecal losses, and 800 ml for losses via the skin and lungs). This includes water contained in food (i.e., it is not essential to drink 1-2 liters of water a day for survival, though it is often recommended for good health).
The sensation caused by dehydration of the body is called "thirst". The sensation of thirst is a dry feeling in the back of the throat and an intense desire to drink fluids. Thirst is regulated by the hypothalamus in response to subtle changes in the body's electrolyte levels, and also as a result of changes in the volume of blood circulating.
Hope this helps.