Way above my pay scale, but sounds reasonable. [facebook.com]
I don't think that that he really understands it either. I have not heard of anyone suggesting that you use pure water.
I did a quick search and couldn't find anyplace talking about 'pure (perhaps filtered) vs ???" water. But he did seem to understand more than many others on what it takes to extract hydrogen from it. Like I said, above my pay grade. I found this an interesting article though. [sciencealert.com]
@captfeelgood He added salts, but I never heard of anyone thinking that you could do it without.