I'm very positive this is a scam for donations. I've spent some time on researching the water/fuel retrofitted combustion engine before ("thunderstorm generator") and find a whole web of pseudo-scientific bullshit (in my humble opinion).
I would be very happy to learn that I'm wrong and that humanity made such a great breakthrough with such simple means.
Being so simple a design, nothing would stop this technology from blazingly fast global adoption.
I heard about this tech round 10 years ago and am still waiting for the news.