15 is too much water

There's a formula in the Brain Gym teacher's edition. I'll get it for you. Only thing i recall is that for approx. 135 lbs, one should be drinking 6 glasses of water a day. (8 oz.)
I drink around that unless it's real hot. I do all the stuff mentioned in the course/book but haven't really attempted to analyze anything other than my end results. I'm figuring it's cumulative.