Well I could be wrong about drinking distilled water even for fasting according to this article by Dr. Mercola.
http://tinyurl.com/5ruqc he gives a thumbs up for Reverse Osmosis, but still recommends supplimentation.
I noticed the other day at the health food store that "Penta" water is RO water.
I use a "Akai" activated Ionization water filter for my daily drinking water. Going to have to research some more about fasting with distilled water. Paul Bragg recommended it, as well as others.