Agree that the large cans of Mountain House dried foods are an excellent prep.
They are said to keep for 25 years, unlike the smaller packs that IIRC are only 5 years shelf life.

Flameless ration heaters have their merits but are expensive, I would obtain a small camping stove that uses either alcohol or disposable gas cartidges.

I can think of a number of possible disasters for which sheltering in place would be preferable to evacuation, it is most prudent to be prepared.

The most likely incidents in my view are severe storms knocking out public services, or a prolonged blackout. Both have happened and will probably happen again.