If your frame has a waterbottle holder under the down tube, that is a good place to keep the fuel. If you need to carry more water , stow it in the bags.A leaking waterbottle will not stink out your bag.
Ive camped in bear country, and seen wild bears. Its not only food you have to keep out of your tent, but anything edible and smelly like toothpaste.
You will have plenty of time to play with packing arrangements, but take the fully equipped bike on a weekend shakedown tour.