If LB lives in a detached home, very easy and inexpensive these days to have a back up generator installed that runs of natural gas with transfer switch that covers most circuits in the home except for AC. Obviously not an option in an apartment or condo bldg. but certainly you can have extra batteries or powerpaks for your cellphone and computer to keep them running during power outages. Cell towers have battery backup for a day or two at most so no tower, no call, even with your backup batter on the phone. Satellite phones work fine in a blackout but are still a bit pricey unless you have emergency communication needs. As for food, lots of options now for freeze-dried kosher meals like we use on camping trips etc (including several with good chassideshe hashgacha). If all else fails, cans of tuna fish work great if starvation is imminent.