Her husband told “Good Morning America" that the station had the information that heavy water drinking could cause harm months in advance of the contest and listeners of the show, including a nurse, called in to warn the disc jockeys that contestants could die from water intoxication.
Perhaps the best lesson to be learned about how much water you should drink comes from Joseph Verbalis, chairman of medicine at Georgetown University Medical Center. As long as you are healthy and your body's gauge for thirst is not marred by age or mind-altering drugs, he says, you should, “…drink to your thirst. It's the best indicator."
Healthy kidneys can eliminate up to one-fourth gallon of water in an hour. If you don't have a risk factor for hyponatremia, how fast you drink water is more critical than how much you drink. Pay attention to your body. Drink when you're thirsty, stop when your thirst is satisfied, and urinate when you feel the need.
Drink water responsibly. A few pointers:
1. It's a good idea to drink eight to sixteen ounces of water first thing in the morning
2. Ideally drink clean, filtered water
3. Try to avoid drinking water out of flimsy water bottles as they are known to leach chemicals
4. Don't over-hydrate while eating or you can interrupt digestion
5. Don't under-hydrate during strenuous physical activity
Selected Sources
http://www.scientificamerican.com/article/how-long...
http://www.mayoclinic.org/healthy-living/nutrition...
http://goaskalice.columbia.edu/whats-main-purpose-...