During training for Badwater, Mike Trevino used sauna and jacuzzi sessions followed by consuming large amounts of water to acclimate to heat and fluid loss.

“and occasionally I would go out and run or when I was training for bad water I learned that you know bad water was all about just becoming a human water filter because you have to push so much fluid in that water just because you sweat so much that I would go and do sauna time so I would run over to a fitness facility that had a nice on and it's Jacuzzi now just focused on raising my my body temp so I'd sit in a sauna and then I would go sit in the jacuzzi and I'll just pound waters and I would go back and work for a few hours and just you might find yourself to be hot and to basically process as much water as possible”