For the stomach, have you tried aloe vera juice/Gel. Taken the first thing before eating, it is supposed to sooth stomach irratations.
As for the water issue, I am confused now myself since I read the link from Dr. Mercola that I provided earlier. What I have said in the past about water for fasting may, or may not be correct.
Better to do your own research.
Here's the Akai water filter machine. Tell you all I know about it.
This in fact is where I purchased it.
Recommended by a Homeopathic practitioner I was seeing.
It wasn't a 40 day water fast, but 40 years of water fasting.
If you can post testimonials from various others about 5 people dying from water fasting, why can't I post about not only not dying from one fast, but 40 years of fasting.
My post wasn't personal either except that I felt you were on the wrong forumn based on your fears.