I'm sorry, but I think that depriving yourself of water for four hours while participating in fairly intense physical exercise is one of those "common sense" bad ideas. I'm sure you do it all the time or whatever, but when you used to hear about kids dying on XTC in the 90's on the late-nite news, it was because they were engaging in intense physical activity without bothering to hydrate themselves because the X was just keeping them distracted.

I sure hope that the circumstance doesn't have to arrive where an ambulance needs to come making a big scene on a football field, taking somebody away because they refused to drink water to prevent themselves from potential brain damage. That is actually very comical.

But for my own existential purposes I have to provide a generally optimistic pledge of assurance concerning the various turns your life (or lack thereof) could levitate or plummet/swerve/crash right at any minute, so like make sure you take care of yourself. But imagine that.