Rightly said that we must drink 8-10 Glasses of water. I generally drink 5-6 Litrs of water in a day. The best way to drink lot of water is eat less than your appitite e.g you take 3 chappatis, take only 2 but with extra Vegetables or Daals. Then after 30-45 minutes you start drinking water every 15-20 Minutes. This way you can drink 2-2.5 Ltr water in between every Meal amounting to 4-6 Ltrs a day. As above eating less Wheat and Lots of vegetables will also help you in getting better nutrients.