Hi, I'm on day 18 of what I expect to be a 30 day water fast. It's going well. I have a fairly clear schedule and am able to rest a lot. Day 5-12 I experienced some severe low back and gluteal pain. I went for my first colonic and the pain disappeared completely. Otherwise, it has been a rather simple fast. I was already weaned off caffeine and I have fast previously, lots of 1, 3, and 5 day fasts and one 10 day fast.
I'd be happy to share my experiences if you have questions.