Drinking too much water can be dangerous. You should stick to what CD guidelines are (I believe between 2 to 3 litres? I should check for myself really!) The has been a case of a woman who did Lighter Life and she drank more than the 4 litres LL used to say to drink. She died due to the amount of water depleting the nutrients from the LL packs and I think causing the blood to thin. I think the kidney need to have to to use up the water or something like that. Anyway i googled it earlier today because i heard a woman on CD also died again to do with the water. Sorry don't mean to scare you but sticking to the guidelines would be the best.