The great water debate. If you are already drinking 8 glasses, Good for you! How can I say this? One way to tell if you are drinking enough water is to check the color of your pee. The lighter the better. Plus if you workout alot you need to make sure you stay hydrated. Anytime you are thirsty is a sign you are lacking water and already getting dehydrated.
Sorry I can't give you an exact formula. Maybe your doctor could reccomend a balance right for you. I drink water all day long. The 1st thing I do when I get up is drink a glass. Since I live in the desert. Water is number. I know people who have trouble drinking 1 glass of water let alone 8.
It helps too if you can drink a glass before you eat. Helps you feel fuller. Also drink cold water. Your body burns calories to warm it up. : )
Eat to Live, Not Live to Eat.