About 128 ounces of fluids per 24hour day between, milk, juice, water, gatoraid and tea.
To maintain hydration of a average individual they should drink half their body weight in liquids
Example: I'm 112 lbs so I need about 56 ounces or about 7 8oz glasses
If you work or have a active lifestyle where you lose a lot of fluids like I do, you need to drink your full body weight or more.
Don't just drink water or tea. It's vital to replace electrolytes that are flushed out of your system. Drink a combination of water/tea and juices throughout the day, or even gatoraid to help replace those electrolytes