How many cups of water should a normal 13 year old drink?

8 to 10 cups of water per day. but for me i know its hard to drink that much. so i drink water whenever I'm thirsty and more if I'm sick or working out. if i feel hungry ill drink a glass of water and wait 15 minutes before eating something. because most of the time when your body says your hungry it really means your dehydrated.