Can you run your car engine on 80% H2O using GEET Technology?

With GEET Tecnolagy you can run your car on 80% water GEET tecnolagy is just a pipe wich runs your water and gas along the exsaust . Wich inturn vaporises the mix in to a gas you can mix your water with oil diesel or any conbustble you have to hands on . So why arnt we all using it?