if you want to stay home during a "incident", just buy more growcery's than normal and rotate the food ( use the older stuff first.) and if you buy in bulk it will be even cheaper than your normall growcery's ! same goes for most other things like batterys, trash bags, fuel, etc.
using formiliar food is much beter than ration's since you are used to it.
most emegency things can be found around the house, you just have to notice it. using those thing to construct a kit will be much cheaper and it will be closer to you specs.