Urine is pretty much sterile. Actually, it's used in some medicines as well. However, it still does have some toxins in it that are harmfull. (Urea comes to mind, but it's still a shit ton less toxic than ammonia)
But it's like this BEFORE it exits the body. Once it passes through and out it collects the bacteria around the exit and is no longer clean. This is why urine smells the way it does, actually.
You CAN drink piss but it's not recommended. Certainly not better than straight out water. Unless you have been drinking alot of water (if you have then you have no reason to drink piss) the urine isn't going to have alot of water in it. The only reason one would drink your own pee is if there's no water in sight and you happen to find yourself in the middle of no where. Drinking your pee might give you 1 more day at most.
And..
>>7
The hell is wrong with you? Eating any amount of feces is dangerous. Unlike urine, feces is nothing BUT waste and unused food.