You should get a heating pad your body temp alone wont get it to the temp you need unless you running a high fever. Also you should get a small 3oz container bottle and store it that way. Buy a bottle of travel shampoo or something if you cant find a suitable bottle. Ziploc might break way to easy just from you sitting down or something i would think. That would be the last thing you want to happen while there is a busted bag of piss. My exp with QF was i used the small heating pad wrapped tightly around the bottle with a strong rubber band and i activated the heating pad 2 hours before any test. Make sure you put the heating pad away from your body since you risk burning yourself if you have it pressed against you. I only used QF once though but the temp was spot on. It did pass by the way for other users of QF