It Runs on Water! - Stanley Meyer (1995)

Stan Meyer's dune buggy ran on hydrogen and oxygen fuel in an ICE motor. Using on board electrolysis, with no hydrogen tanks, just water!

Stan Meyer's Water Powered Dune Buggy
https://www.waterpoweredcar.com/stanmeyer.html

US Navy Sees Seawater as Fuel
https://en.topwar.ru/43896-vms-ssha-rassmatrivayut-morskuyu-vodu-v-kachestve-topliva.html

Inventors Who Invented Water-Powered Cars, But Were Killed or Forced to End Their Work
https://anonhq.com/inventors-killed/