Good idea. You mean something like this, right? https://www.amazon.com/MSR-MSRFUELBOTT-Fuel-Bottle/dp/B002L1413S
Realistically I just carry a fuel bottle for the stove with some gasoline in it. That way I can run the stove, but if I need it there's also a little spare fuel for the bike.
If I need to move it back and forth, a few feet of this: https://www.lowes.com/pd/EASTMAN-3-8-in-x-20-ft-PVC-Clear-Vinyl-Tubing/1000180543 Will make a siphon just fine.
ETA: These are the fuel bottles that the stove uses: https://www.amazon.com/MSR-MSRFUELBOTT-Fuel-Bottle/dp/B002L1413S
My buddy just has 2 1 gal stainless steel tanks that he throws in a backpack.
My dad has a left side number rear number plate that he bolts onto his KTM.
http://www.motosport.com/acerbis-auxiliary-handlebar-fuel-tank
https://www.amazon.com/MSR-MSRFUELBOTT-Fuel-Bottle/dp/B002L1413S
I tried using a non venting gas can, transmission fluid bottles and an old MSR Stove fuel bottle.