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I was watching 127 hours - the guy is stuck and he had a about 2 liters of water or so. He was able to figure out via math how long or how many sips he should take to survive for a few more days.
How do you really do this? Is it just a guess and drink as thirst keeps returning?
Talking about a true survival situation... if you need a starting point lets say: 3 liters of water for a 180Lb. male.