I "personally" don't know a whole lot about water fasting other than what I've read here and there. I'm just not personally attracted to it. Dunno if it's a personal fear or just plain ignorance on my part but I just consider it "too radical" and for sure I would not attempt it if I had to function in the real world while on it. I don't have any rational reason for the previous statements just my own intuition Even when I do the MC I try to do it at a time that I'm not busy at all or just a little busy so I can fully take advantage of the inner journey aspect.
The guy "in the know" in the water fasting forum is ChrisB. He is a walking encyclopedia on water fasting so I suggest you head over to the water fasting forum and read his posts.