Is your huge 1L bottle of water that you take to the gym enough? Do you live with the illusion that you drink enough water because you chug down two bottles during your fitness class? 

We need to drink 8 to 10 cups per day ON TOP of what we drink at the gym. The bottle you carry with you when exercising is only to replenish the water that you lose with sweat. Keep drinking! Always order water at a restaurant, not only will you stay hydrated but it’s also cheaper than any other beverage!

This article tells you how drinking water can even help you lose weight.