A theory like that ignores most of known basic physics. What would the energy source be? It does not matter what chemical or electrochemical reactions are poss

A theory like that ignores most of known basic physics. What would the energy source be? It does not matter what chemical or electrochemical reactions are possible in general, what matters is where does the energy come from. Water does not contain any energy. (Not any chemical energy that can easily be extracted. Of course it contains energy in the sense that E=MC^2, but in that sense we have about the same chance to run a car on sand, or rocks or oreos.) On the other hand, if you do have an energy source, then why would you need water at all?? You would just use the energy to drive the car (like EVs do), you wouldn't waste half of it to hydrolysis of water into hydrogen first to use that hydrogen... A theory about a "car running on water" (which, at least in my experience is often followed by conversations about how Nicola Tesla could transfer energy through the air, or about how government has all the technology for infinite energy, but they block it from being used because they are evil) - is a pipe dream which is heavily based on ignorance about physics and gross underestimation of the difficulty of real engineering problems.