 medical conditions. So you really want to watch that. The National Academy of Sciences recommends that men drink 13 cups of fluids daily and that women drink nine cups daily. So this can include water, coffee, tea, other beverages. It can also include water-filled vegetables and fruits. So watermelon is a great example of that. And one easy way to know if you're well hydrated is if your urine is clear, then you know that you've had enough to drink.