Parking yourself nude under a cold shower will keep you alive, assuming you don't run out of water. There's no need for the bath. The shower will probably wor

Parking yourself nude under a cold shower will keep you alive, assuming you don't run out of water. There's no need for the bath. The shower will probably work better actually since it's constantly disposed down the drain after picking up some heat, and replenished with subterranean-temp fresh water running across your person.