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I’ve experimented with hydrogen.

The welder you describe uses electrolysis, to split the hydrogen and oxygen from each other. Problem is...it takes electricity to do this....and it is only 40% efficient.

The experiments I tried were to basically use spare battery power to create a small amount of hydrogen, and vent to the intake (hydrogen ‘boosting’)

I actually got worse gas mileage, since the O2 sensor sensed too much O2, and compensated by pulsing more fuel in.

This can by fixed by reprogramming the car’s computer...which I can’t do. There are commercial kits which do this. However, I can see problems with the water freezing in the winter; and, the plates used in the electrolysis (stainless steel) immediately have a coating form on them...which would have to be periodically scraped off.

All in all, not a great idea (hydrogen ‘boosting’).

And actually using water and battery power alone to power the car? Won’t get very far - alot like using a fan to power a windmill. So don’t worry, no conspiracy to be found.

One option experimented with in Japan is home fueling stations for hydrogen. Essentially something very similar to that welding box is converted to fuel up a hydrogen fuel cell...and this can be done in your garage. The problem comes back to the efficiency problems of using electricity to get hydrogen...and this is less economical than gasoline.