but the amount of water a person needs varies depending on his or her weight, activity level and climate.
Another way to determine your specific recommended water intake is to divide your weight (in pounds) by two.
The resulting number is the number of ounces of water you need each day.
For example, if you weigh 150 lbs., strive to drink 75 ounces of water daily.
For those who use the Metric system, divide your weight (in kilograms) by 30 (ex. somebody weighing 70 kg is going to need 2.3 liters per day).
Keep in mind that these recommended intake numbers are controversial and some experts believe they are a gross exaggeration.