Far from gourmet dining, but even without a gas burner one can survive on cold beans eaten straight from the can, tuna, spam, sardines, crackers, nuts, raisins, dried fruits, trail mix, MRE's, freeze dried foods, granola bars, power bars, etc., etc.. Lack of drinking water could be a problem, so some type of filter might come in handy. The trick is to have a cache of similar items BEFORE the earthquake strikes.