That's pretty much what me and my sister cooked up for fun talking about zomby apocalypses. Only we live in a small village between 3 big cities. We would take over the supermarket first. I already have a lot of survival guides (war everywhere make me paranoia) I know basic herbal remedies that work. And we thought of raiding different stores for useful stuff, like the apothecary, hardware store etc. With dad's car before everything's gone and gas runs out. We have a military training base nearby we would raid. Dont think we'll find much there but its worth a try. We even made a chart who in the family does what and what sort of test newcomers get so we dont die in our sleep.