From the reprint of the Department of the Army Field Manual: US Army Survival Manual, page 3-2
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Do not use sea water or urine under any circumstances. Although they will satisfy thirst temporarily, they actually cause additional water loss from the body, promote dehydrations, and if taken in sufficent quantity, will kill you.
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Then again, wikipedia says of urine
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Shipwrecked or people otherwise adrift at sea for long periods often resort to drinking their urine when no rainwater is available, seawater being unsuitable. People stranded in deserts often also drank urine to prevent life-threatening dehydration from setting in.
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