Watched “Man vs. Wild” on Discovery last night. He was out in the Australian Outback and essentially out of water; so to help prevent dehydration he drank his own urine. I don’t trust his survival techniques implicitly because I’ve seen him make mistakes and “cheat” a couple of times.
Now, I was under the impression that drinking urine or seawater, would actually make you more dehydrated because salts require more water to flush from your system. Yet I could see that if you need fluids now, and you aren’t going to be drinking this exclusively, and you have promise of fresh water in the near future; it might be better to drink your urine or seawater.
My question is: Under what circumstances would it be advantageous and life saving to drink this stuff? (i.e. do it if you know you will die in a couple hours without it; or if you know you can get fresh water in half a day)