Drinking enough water can have numerous benefits. One important factor is that it can help boost the amount of calories you burn. According to two studies, it can boost metabolism by 24-30% over a period of 1-1.5 hours. This can amount to 96 additional calories burned if you drink two litres (67 oz) of water per day. The best time to drink water is half-an-hour before meals. One study showed that half-alitre of water, 30 minutes before each meal, increased weight loss by 44%.