Just reading this "http://www.humankinetics.com/excerpts/excerpts/introduction-ndash-a-change-in-view-of-hydration"

I myself never drink for up to 2 hours during my intensive running in scorching sun. During obstacle race that lasts 2 hours I do not drink at all or very little (if I run during hot day).
I think that this obsesion with compulsive drinking during athletic performance in many athletes is mind generated anxiety rather than actual physical need.
It is so annoying when during some workout (like circuit or intensive conditioning calistehnics) we have to take a break every 10-15 minutes because some atheletes have to compulsively suck on their water bottles.