Thanks a lot for the reply biggmoneyme, it really does help calm down the nerves a bit! I've been practicing this entire week with 2 pairs of boxer briefs and a hand warmer and the hottest the practice water has gotten is 102 degrees, which should be fine considering it drops a few degrees when pouring it into the test cup. I'm just worried about the consistency and integrity of the human urine that I'm getting from my buddy on the actual test day because it will be in a non-sterile container for 3+ hours at 98 degrees. I'm worried that either the heat or bacteria or both would somehow mess with the pee and invalidate the drug test.