Looks like my estimate was accurate- you are packing twice as much as me. And you don't have 7+ liters of water in there. :P

How big is the pocket in your PFD that you are looking to use for your pot? (Wow, that looks wrong.) It isn't much, but a stainless, tall flask might work if the can doesn't. The big thing to remember is that you NEED a multitool or another pair of pliers to handle these things. Or poke a couple holes just under the rim, so you can pack a small bail made from a coat hanger.