Magpie - please consider this. While it is true that in some cultures urine is consumed, it is not done so in "survival situations", but rather as part of a ritual or other such thing. In a survival situation when you become dehydrated and desperately need water the concentration of harmful byproducts in urine are at their highest, therefore the most harmful to you. It is those harmful byproducts that will, in your weakened condition, bring the onset of increased thirst, dehydration, organ failure, etc. Think back to Rick's post - Urine is clear, have no fear - Urine is yellow, you're a hurting fellow. When you are dehydrated your urine will be darker (can be almost orange in extreme dehydration cases) at which time the toxicity is extremely high.
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