I've known people that lived by the hydration rule religiously and they always seem to have medical issues. I believe the two liters rule should incorporate common since and not make it a religious habit.
"In fact, there’s a lot of marketing behind popular hydration recommendations, Sims says--with potentially dangerous consequences"
http://www.foxnews.com/health/2014/09/28/are-overhydrated/?intcmp=obnetwork
"In fact, there’s a lot of marketing behind popular hydration recommendations, Sims says--with potentially dangerous consequences"
http://www.foxnews.com/health/2014/09/28/are-overhydrated/?intcmp=obnetwork