this is a subject that has driven me nuts for years.a metal container for the kit that can be used to heat water and cook in.
i have looked around for one that would fit my overboard vests survival kit and the best i could come up with was the Swiss Army canteens cup with a wire bale added.i'll be spending the winter looking for something with a tight fitting lid rather than the foil,duct tape and overlapping zip locks i'm using now

below is the food that go's into that canteen,mostly dry pea soup tabs.

and what it looks like sealed along with the "hurry up" fire making kit that sits on top of it in the zipped up PFD pocket.