Just hotbox your washroom. with the shower running with hotwater. Fuck the hottub, you'll drown, it'll be cool if it was oyu and a girl under the lid, with no water, so you have somethin to do after, but what are you guys gonna do under there, other than burn up. If you have a car, you can do it in there, I remember it was like 30 degrees outside during the summer, and we were in a car, with leather seats, hotboxing 3 blunts, and we didn't even open the door until they were all done. When I walked out, i couldn't even walk lol