I'm trying this dare at the moment, and it's going quite well even though I had to piss from the beginning.
I first threw 6, that wasn't too harsh: 1 glass and 15 minutes waiting.
After that I threw a 4, which meant I had to go to 10 --> 12: Another glass and 15 minutes waiting.
I have a feeling the last couple of tasks are more difficult, but we'll see. I haven't peeked yet
Edit: It didn't, threw a 6 and the game was over. Too bad.