As much as I respect what you and your friend are doing I encourage you to eat at least a little raw foods like nuts, or raw veggies along with the water so you don't traumatize your body too much. Also, its important to remember to pray and draw on your spiritual strength to help you endure the suffering you will have to endure during the detoxification process. It also says in the Bible that when you fast you should appear to others that you are not fasting and it should be like a secret. Just something to think about. The best news on this whole post to me is that your friend is giving up cigarettes which is proven poison. Good luck to you both. Pretty cool that you are doing this.