Water accounts for approximately 70 percent of an adult's body weight. While we get a lot of water from the foods that we eat, it is important to drink plenty of water to replenish any that gets used throughout the day. Adults should try to drink half of their body weight in ounces of water per day, according to Dr. Fereydoon Batmanghelidj. This means that a 160 lb. man should try to drink 80 oz. of water per day. This number increases if you live in a warm or dry climate.
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Weigh yourself to determine your precise weight.
Divide your weight in pounds by half.
Convert this number to ounces. This is the amount of water you should try to drink each day. For instance, a 160 lb. man should attempt to drink 80 oz. of water per day.
Fill a glass, water bottle or any other receptacle from which you frequently drink with water. Pour the water into your measuring cup to see how much water your receptacle holds.
Multiply the number of cups your receptacle holds by 8 to determine the number of oz. the receptacle holds.
Divide the number of ounces of water you should drink per day by the number of ounces your receptacle holds. For instance, if you weigh 160 lb. and have a water bottle that holds 10 oz. of water, divide 80 by 10 to arrive at 8. This means you should drink 8 full water bottles per day.