I simply threw out the fuel cell notion as yet another possibility... Honda was (no idea on current status) putting a LOT of effort into both the Hydrogen Fuel Cells and CNG.
I like the idea of a Hydrogen fuel cell, even have a musician friend who has done considerable experimentation with one. In the end he had to abandon the project because the technology for small-demand refill sites was not developed and he could not produce enough hydrogen "gas" with his limited setup.
Making automotive fuel out of water is an intriguing idea...and the "dream" has been around for a long time!
Cheers!
Doug