Somewhere around here is someone who made a neat little "water caddy" w attached pump I believe using a small hand truck and 2 plastic jugs.. Sorry, best I can do............
Other than expensive.. like this:
http://www.water-storage-tank.com/portablewastetank.html
http://www.boatdepot.com/p-6618/todd-water-caddy-28-gallons?gclid=CIGUh7zAsL0CFSwdOgodHQsAmw
or fleabay:
160932203954