This from WebMD:

When Healthy Habits Backfire

Some Healthy Habits Can Cause Trouble; Find Out What to Do (continued)

continued...

4. Drinking Water. From liquid, don't fret. My doctor told me 50 oz. a day is plenty because we also get water from food.

I've never been a particular believer in drinking more thanm what you're thirsty for. Nor do I believe what you drink has to be plain Water.

coffee and tea and such DO count towards your water, you just might need a bit more due to the slight diuretic effect, which is virtually negligible anyway once your body is used to caffeine.

And I think the theory that when you're thirsty its already too late is complete bollocks. Ah, thirst is there for a reason - to tell us its time to drink something! Why on earth would we feel it only AFTER we should have drunk? Do we get hungry only AFTER we should have eaten? No. Do we feel the urge to pee AFTER the event? Thank goodness, no. Well, not usually, lol.

I think lining up bottles of water and thinking I must get through these today is kinda silly. Drink what you want when you want.

I agree jachut I drink when i am thirsty. I do try and drink every time i work out but i don't keep track of how much water i drink i just drink when i feel like it.