Sometimes. During hurricane season [thankfully it's rare we get
   them], I have enough water/food for a few days.

   The trick is to have enough stuff available long enough for
   rescue efforts to come.

   Most disasters aren't FOREVER disasters; emergency response
   teams are more or less prepared to handle WHATEVER weird crap
   comes by.

   You can see if you have a CERT (Certified Emergency Response
   Team) in your area. I joined one for a few years. Learned about
   local area potential issues and how to handle them, even down to
   writing out a toe tag or marking a house as unsuitable for human
   habitation. [and how to recognize it].

   I'm not a part of it now, but the training is good to have.

   So, it's good to know this stuff. A few days water, a few days
   food, battery backup, a generator is good if you can but a car
   with gas and chargers is usually enough.

   Gas masks? Probably not. A year of food? Probably not.

   A camp stove with a couple of propane tanks? Yes.

   In short, "In case of emergency (ICE): PREPARE TO GO CAMPING FOR
   A FEW DAYS....at home.