How much water should you drink for each pound you are overweight?
No matter how much one weighs (thin, medium or heavy) it's 8 - 8 ounce glasses of water per day. The only time you may need more water is if you are jogging or exerting yourself or become dehydrated by hot weather. Too much water isn't good for you either. Drinking that 8 glasses of water a day is flushing out toxins and fats in the body and keeps the kidneys in good shape.
Your output would equal your intake so there would be no net change in body weight. If you drink ice cold water, your body will burn some calories as it warms the water up to body temperature. You would burn 175 calories if you drink one liter of ice water. 3500 calories equal one pound. So if you were to drink 20 liters of ice water, you would lose 1 pound.