Matt Stone (180 Degree Health) has some interesting ideas on hydration. If you don't mind irreverence and aren't easily offended, you can find him on Amazon.com, his infrequently-updated blog, of his now-defunct podcast.
/www.amazon.com/Matt-Stone/e/B001KIM1IA180degreehealth.com/blog180radio.com/shows/talk-shows/180degreehealth-podcast (See Episode #22)
Also...
/www.slideshare.net/180DegreeHealth/are-you-drinking-too-much-water