Then you have the effort of preserving all the food. The modern house isn't a great place to store potatoes. You'll probably want to can/jar most of it. I mean you could freeze it, but in a survival situation you probably don't have reliable power. Oh, and like you said with a dry spell, where are you storing enough water for the dry season? We just got over a 60 day spell with no rain. Wouldn't want to try and survive here.