Someone gave me a $600.00 Ryobi Pressure washer that is two years old and wasnt working because it sat for so long. All it needed was an O-ring. I thought about selling it but would like to try and give sidewalks and driveway services a shot. My question is what will I need? Craigslist has 55 gallon white drums for $5.00 each right now so I figured I could use that for water. With the drain being on the bottem of the tank, will that be enough pressure coming from the tank to the washer? How are these usually setup? Will 55 gallons handle small driveway and sidewalk jobs?