Depending on your scale, it might be appropriate. Most of us plan on us and our families, but I imagine that some of us do emergency planning for larger organizations and for municipalities.
A barrel, scrubbed and burned clean and cut down, turns into a good grill wth a couple of cinderblocks for support. Two is better.
Use a couple chucks of coarse, strong twine to hold the blocks together, on top of a small piece of plywood.
Stick the two halves of the barrel together with a half dozen ig bags of charcoal inside on top of tthat. Stick 6 lengths of scrap rebar in there, wide enough to span the barrels, plus two sets that can hold a cross piece about a foot over the top of the halves in there to.
Lash a length of rebar that is a foot long that the barrel is long to the side, and wrap it up in chicken wire or harware cloth around the outside, pre cut so that you can fold it over the barrel halves, using the short bits of rebar for support, and making them short enough to leave about 20% of the top open so you can add fuel.
Once a year, twice a year, change out the charcoal, put in fresh matches. Other than that, leave it sitting in the corner of the shed.
And when the stuff hits the fan, your local boy scout troop or REACT group or Elk/Moose/what-have-you lodge has a cook station that can can be assumbled in half an hour, trasported with a pick up and dolly by two or three people. If it goes on longer than you have charcoal for, you can burn whatever you want.
I might add a large stailness steel pot, say the 8 gallon size, a long handled laddle with a one cup bowl, and a couple extra cinder blocks to hold it over a barrel half. That is your water pot- you draw from there for cooking, tea, coffee, hot cocoa, etc. And possibly a piece of sheet steel to serve as a griddle.
And you can use it for the regualr cook outs, to, so you don't get mistaken for a paranoid nut. A decent project for a troop of medium-junior scouts. The only hard part is getting the steel drums.