Pick-up a $8 gallon bottle from VW dealership and drill a 1" hole in the side at the bottom (not ON the bottom though). Go to autozone etc or your local truck stop and get a few gallons of the stuff cheap, pour it into the jug with the hole and put a rubber cork in it so you dont splash it out while you're pouring.
Fill one gallon at a time. When the fill tank equalizes with the bottle, you're done!
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