[AeroE]

joshp; you're correct if referring to fresh water, although where I live we currently have an abundent surplus-want some? If you wanted to use electricty to extract hydrogen from water, sea water would work fine, and there is no shortage of that. The water isn't lost when using hygrogen; when burned it converts back to water and eventually will end up in the ocean. Solar isn't a practical energy source except for remote cabins, DOT signs, spacecraft, and home heating (I did solar energy research as a career for a number of years). The only currently feasible way to use solar for hydrogen is to convert to electricity with photovoltaics, and this is far more expensive per Btu than $7/gallon gas.