8 to 10 glasses at day, a gallon is too much for your body
8 Glasses A Day Is Supposed To Be The Standard. But Honestly You Shouldn't Focus ON How Much Water You're Drinking. A Gallon is pretty good. You should be drinking before, during and after workout/training and take drinks every 10 minutes during to keep yourself hydrated.
To begin with, it's a matter of trial and error - Weigh yourself naked with accurate electronic scales before the workout or sparring session, and then weigh yourself again immediately afterwards. If you have lost weight, you aren't taking in enough fluids. If you've gained weight, you are taking too much. After a short spell, you will soon know how much fluid intake is just right for you!
Try 8 glasses a day
that's a good amount for doing intense training
Like cups. Cus I try and drink a gallon each day to hydrate myself. Is that too much ? And because I hate feeling dehydrated during intense training.