Drinking one's urine to avoid dehydration (as in, "I'm out of water, thirsty, and I'm going to die if I don't drink something so I'm going to drink plenty of urine") is a quick route to some serious kidney problems....and it won't help your dehydration. In fact it will make it worse because your body will use more of its limited water to flush out the increased concentration of waste that you've put back into your body. All reputable survival training courses agree on this point, although some asian medical practices suggest drinking a small amount every day to avoid various illnesses. Me? I'll stick to my morning coffee, thanks.

This also applies to drinking sea water if you're in a survival situation in the ocean, but I suppose that's pretty rare while on tour...

Sam