The Institute of Medicine (IOM) recommends that men drink at least 101 ounces of water per day, which is a little under 13 cups. They say women should drink at least 74 ounces, which is a little over 9 cups.
To prevent dehydration, you need to get plenty of water from drink and food every day. There are many different opinions on just how much water you should be drinking every day. Health experts commonly recommend eight 8-ounce glasses, which equals about 2 liters, or half a gallon a day.
The Institute of Medicine (IOM) that men drink at least 101 ounces of water a day that is (little less than 13 cups). And, women should drink at least 74 ounces that is (a little over 9 cups). Water Intake Recommendations: However, the 8 glasses rule is just a good start, but it is not based on solid and well-researched information.