How in the hell would knowing what you're doing to yourself take the fun out of doing it? I researched psilocybin extensively before I took mushrooms, and I still tripped just as hard (actually, probably harder, as I knew to drink some OJ) as I would have.
On the topic of urine, you can actually drink your own urine twice before the ammonia content becomes too high.
Survival 101 over here, right?
It's called fucking nasty.