Not to drag this too far off topic, but it sounds like you guys are talking about the “plasma” engine, which could run off of any liquid, the idea was right out of sci-fi.
*Run an engine on a hydrocarbon up to operational temperature, have a second ‘fuel’ which is comprised of any liquid.
*During engine operation, run secondary fuel through special fuel lines which are encased by the engine exhaust. These fuel lines contain magnetic screens, combined with the temperature of the exhaust system ‘break’ the bonds of the elements phase changing the liquid into a plasma state (this research has been discredited)
It all goes on like it’s straight out of a movie, and the wonderful thing is, considering how detailed the information is on it, we cannot replicate it, an engine wont run on water, not unless you use electrolysis, at which point you are at an energy defecate.
Basically, there have been lots of ‘fun’ conspiracy’s over the decades.