Although this is my first clease, I will give you my take with your water question as a nurse. The rule of thumb is to drink half of your body weight in ounces a day for example if your husband is 180 lbs than he would need at least 60 ounces of water a day. and remember that the lemonade although mostly water, this is his food replacement. My suggestion to your husband would be to at least drink 32 ounces or so of pure water to help flush his system out. Also you lose a lot of water through sweat, breathing and stool. put his activity into consideration and maybe see how it goes for a day drinking more water. I hope this helps and did not just confuse you more. Good luck. Mel
P.S. He just does not want to get dehydrated on this cleanse or it would be pointless to go through all the rest of it.