Well lessee what kind of pics I have on hand. I use the film canisters as tanks themselves, and as containers for floppy balloons and pressure bladders.
I use 1/16" alum. tubing through punched (not drilled) holes, glued in with GOOP. Roughen up the plastic first with sandpaper. Well cured, GOOP seems pretty fuelproof.
You can get 1 oz. of fuel in a canister, or 3/4 oz. in a balloon inside one. When I need more (thirsty .061) I put two together with GOOP.
--Ray