Yes anything to do with a cleansing of the body requires a lot of water. Water is a great detoxifier and since you are losing nutrients it's best to keep up with your water intake otherwise you will experience headache. Just be careful with products that cleanses the colon. Also, the constipation is due to lack of water because when it gets to the large intestines water helps break up the bacteria otherwise the "crap" just stays around the transverse colon area before it goes to the descending. Good luck
