Car Wash

I know that i need rags, brushes, products etc. what i dont know is what do i buy to get the water to wash the cars, like what powers the pressure washer, etc

Most people use a gasoline powered pressure washer. you can get water either from a long hose ran to a nearby building, or you can get one of those large water tanks, usually 90+ gallons. most people mount the pressure washer and tank combo to a small trailer, or inside a large work van. then, like you said your soaps, cleaners, waxes, polishes, chamois, a vacuum, interior carpet cleaner, a brass brush, a ton of rags, etc. its all at www.detailking.com