Water is not optional - your body and mind does not function properly, and you freeze much faster without fluid. Peeing color is the best indicator.
Definitely true. I have had occasion ro review field notes I had taken in a severely dehydrated state and it was clear that my judgment, especially my estimates of distance, was shutting down... Just when you need to think clearly.
If urine is anything other than clear, it is time to take in more fluids. (if possible)
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