Reading this thread is like a trip down memory lane.
A few years back, I decided that a periodic 1-2 day water fast wasn't getting me where I wanted to be, so I opted to try for the Big Kahuna: 30 days water fast.
I was very impressed that virtually all of my "emotional eating" subsided by day 4, and I smile at all the well meaning people here who talk about how "dangerous" a fast of 30 days can be. I remember the "acetone breath" very well.
My 30 day fast attempt ended at 17 days because I got lazy and skimped on water intake. I got a nasty little kidney infection because my kidneys were trying to do their job and filter out toxins and I wasn't "lubricating the machinery" properly.
Some other thoughts:
1. Distilled water makes it tougher. Spring water does a lot more for you preventing mineral imbalances. My goal was to cleanse my alimentary system, not whack electrolytes and monkey around with mineral deficiencies.
2. Don't drive after 2 weeks. You'd be surprised at how slow your reflexes have gotten.
3. Scrape your tongue with baking soda, not toothpaste. Toothpaste taste triggers hunger reactions and it'll take a day to reset.
4. Don't play softball in the hot sun on an extended fast. Just trust me on this one.