I have been laughing hysterically thinking about someone pulling a wagon with water jugs in it. thats hilarious Newb!
Seriously though Carlos, if you don't have lids for the water jugs I have seen people use duct or masking tape to cover the top or even use rubber bands to hold a piece of plastic over the top. Like the plastic that the marine salt comes in. I have personally transfered about 6 5 gallon jugs this way and had no real spillage. Just whatever you do don't take the corners fast!