Anyone buy water for gas?

I heard about this new technology that lets you convert your car into a “water hybrid.” Does anyone know anybody who can buy water for gas or does so themselves? I have a HEMI powered Dodge Ram because I do a lot of hauling, but the fuel cost are about to push me to the point of needing an alternative fast. A diesel would not really help me much because it cost so much more than regular unleaded, so I have been looking into ways to boost fuel economy and heard about water powered cars, or convertor kits to make your vehicle into one.