The reason we need water is to maintain our body functions. We can survive much longer without food than we can water. If we dont drink enough water then our kidneys arent working right which means our liver has to pick up the slack which is taking away from metabolizing our fat---whew..lol ok hope I explained that right. U need to drink at least 64 oz a day plus another 8 oz for every 25 pounds U want to lose. I would reccommend tho the more U drink a day the better. If U can try to get at least 100 oz a day.