Ask Bear Grylls about drinking urine. It could save your life in the desert, but you have to find and skin a snake to hold it if you don't have your own drinking bottle .
....I've seen him eat the grossest of things, he even made a 20 thru 1 worst of the worst things he's consumed.
The episode where he carried that snake skin full of his own **** and then drank it was # 1 on his most horrible list....and it had him nearly gagging it up several times.
I bet a few SAS boys could tell a few stories, lying down in infested mud and bugs for days on end...living off whatever they can gather.