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Originally Posted by VitaminH
I'd like to dispute this. While urine is generally sterile (unless you have an infection in your bladder, kidneys, or tubing) drinking it to survive when you have no water is not a good idea. You're just reingesting stuff that your kidneys will have to re-excrete, causing you to lose more water.
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At which point you re-cycle the re-excretions. If you're going to die of thirst and you can stomach it, swallow it. I think my bio teacher mentioned something about a point in this process (after several instances of recycling) wherein the urine becomes so concentrated in waste that it stops being a good idea.
To add my own bit of urinary knowledge, you can eat psychedelic mushrooms and then proceed to pee into a container, which may then be drunk by someone else who will trip. This is supposedly applicable to about 5 grown men down the line (ie One guy eats the shrooms, next guy drinks his urine, next guy drinks the second guys urine, and so on).