Ironically the modern lifestyle makes it difficult to listen to your thirst...
When I was out on a survival trip - all you really do is listen to your body; drinking five liters of water a day was quite natural - I had three Nalgene bottles attached to my pack! Despite freeze dried food, it is probably the healthiest I have eaten in my life as well.
You lose weight within two weeks also - smaller stomach/intestinal system and loss of excess fat due to the altered diet, constant exercise, and of course - loads of water.
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