The benefits of drinking water cannot be over emphasized. You need to stay hydrated from within. Aim for about 2-3 litres a day. Have it in mind that, staying hydrated does not include Caffeine intake, because it is a diuretic and diuretics eliminate fluid out of the body, so you may need to cut back on the coffee this period. Go for beverages and fruit juice to keep you hydrated. Also eat lots of fruits and vegetables to keep your skin glowing.