If you are going to "live off the land" in the aftermath of an urban instant disaster, what is on your shopping list?

Shelter: garbage bags are good and readily available.
Water: bottled water also readily available in the immediate aftermath. Not so much even a few hours later.
Food: Jerky, power bars, candy bars are also available in the immediate aftermath and won't last long.
Maps are surprisingly hard to find, at least in my experience.
Baby wipes are good for hygiene. Sunscreen, bug juice, lip balm.