I have two one gallon fuel jugs (small red jugs intended for gasoline, but I use them for glow fuel). I simply poked two small holes in the top of the jug and insterted my fuel lines in. One for the pickup and one for overflow. The holes that I made are just a little bit smaller than the size of the fuel tubing so that makes a good seal to keep the jug sealed up. I run these lines outside of my flight box and hook up a hand cranked pump to fuel my planes. When not in use I connect the two lines (pickup and overflow) together to keep any moisture from getting into the jugs. I've been using this setup for about 7 years now and have never had an bit of trouble with it. If you look at the attached picture you can see the set of fuel lines on the left have the pump hooked up to them, and the set on the right are connected to keep the jug sealed.

Just in case anybody asks, I use the gallon gasoline jugs because they will fit into the bottom of my field box!!

Ken