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A few things.
First of all, generating hydrogen requires energy. It is available in water but you have to extract it.
Also, hydrogen is relatively voluminous unless you compress it. So if you wanted to make a solar-powered hydrogen generator, you'd need some power to generate it and more power to compress it. Plus you'd have to refill your water supply every so often.
On the other hand, there is the possibility of just carrying a compressed-hydrogen bottle. While this is technically feasible, propane is a lot more realistic and more available. Refilling your hydrogen bottle would require special filling stations or gas suppliers.
If I were to generate my own hydrogen, I would set up a fairly substantial solar- or wind-power station at home, and use this to generate and compress my hydrogen. Then I guess I could get a fair quantity of distilled water fairly cheaply, since it's only 99 cents per gallon at the drugstore and probably less expensive in larger quantities.
Anyone know an "ideal" compression ratio for hydrogen? I suspect you'd need higher than 9:1.
-Bob C.
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