I consider having kids to be ready-made for disaster food.
Even though our kids no longer need it, I buy a big tin of baby formula every year to provide dairy/protein in case of bug-in.
Our kids love PB&J. PB does not need refrigeration and we always have an extra tub laying around. Jelly will last for days w/o refrigeration before going bad. A loaf of double-fiber bread in the freezer keeps indefinitely and will keep for days after pulled out of the freezer when SHTF. PB&J + DF bread is several day's chow for the kids and they would eat PB&J every meal if we let them.
The freezer chow will keep a day or so before becoming un-froze after power loss. All of that will be eaten first, before any cans are opened (other than canned veggies). The london broil that I marinated in cran-grape for 72 hours and then froze in the marinade will be #1 thing on the grill. We'll start SHTF in style.
I have 2 propane tanks. One on the gas grill & one on the smoker. The smoker will not be used during SHTF, as the gas grill is more efficient with propane. We also have a big-*expletive deleted*ss bag of Kingsford charcoal, which can be used in the smoker if/when the propane gives up.
Ranch Style beans and canned chili are popular with us and lasts a long time. Just be sure not to re-enact the beans+cowboys+camp fire scene from Blazing Saddles.
Dog food. We have an airtight plastic dog food bin that holds 40lbs and keep another 44lb Costco-sized bag in addition. If worse comes to worst, we'll "Mad Max" it.
I do need to keep a bigger supply of wate on-hand, though we have a water heater tank and a 4-stage rev-osmosis filter on the kitchen sink faucet.