Just a bit of trivia, but could come in useful in a SHTF situation - You can also boil water in a paper cup, the water keeps the paper below its ignition point. True story, remember watching this demonstrated in a high school science class.My favorite SHTF food is tuna/salmon in the foil packs. These are essentially MRE's, having about a three year expiration date. They are light, filled with yummy protein, and very juicy. Plus, the bags probably would be good to use to drink out of or might even work to boil water. But the main thing is that they are light, and very flat, so they store well in the pocket of a backpack.
I always keep family with me.