Unfortunately, this restricts athlete's access to fluids during school hours. Water fountain use during class breaks is not adequate to meet an athlete's needs. Some schools alter their policies for wrestlers a few days prior to the urine specific gravity test allowing them to carry water bottles in school. While this helps them hydrate for the pre-season test it does not help with their hydration needs during the entire season. While water is never a bad choice sometimes it's not the best fluid for the job.
Water is a thirst quencher.
It turns off the thirst mechanism and athletes stop drinking before they're fully rehydrated. Water is also a natural diuretic. It signals the kidneys turn on and produce urine. They contain small amounts of sodium and glucose. This combination has been proven to promote re-hydration.