Personally I have some canned food that I just don't find all that appealing, which I could eat if I needed to. Probably enough to get through a week. What I don't have, but I'd like to have, is a reserve of fresh water. A plastic 5 gallon carboy would be enough. I also have my hiking, camping, and skiing equipment which I could use inside my apartment if the heat went out in the winter for an extended period ... although after a day at -20 I'd probably start burning books and furniture. I also try to keep at least 1000 cash on hand at all times, and try to refill my meds when I still have 1 week left.