So I've seen several people use other peoples piss, and this and that and how you have to keep it heated and this and that. But I got a test coming up. Have to take it every month. After I'm finish pissing, I sit the cup on the sink, they stick the little stick in there, and it tells if I'm possitive or negative. Where does it show the tempature so they will know if I used other piss or not?

from my experience there was a tiny thin strip on the lower part of the cup that had little holes numbered 90-100 (even numbers) and these holes would change color depending on the temperature of the sample.

It's possible that the place you're going to doesn't use temperature strips (I've had this). But it's better to be safe than sorry- heat your sample to the appropriate temperature. If they don't test the heat, oh well. If they do, you're set.

BTW, I'd definitely recommend Quick Fix instead of another person's pee.