+1 propane generator....this would take a whole lot of headache out of the sitty-a-shun
You can store tanks forever (if you have space)
Us Carb is a great place for conversions or here is their Yamahas Tri Fuel- not cheap, but a good investment.http://www.yamaha-propane-natural-gas-generators.com/
Propane heaters (I use the Big Buddies, you can hook up large tank or refill the 1lb from a large)
Propane stove/oven This one works pretty good http://www.amazon.com/Camp-Chef-Camping ... B0013LLSZG
Food reserves should be the main goal (rotate to keep fresh, and also to not have a shock on your body to transition)
Backup way to filter or at least purification tabs etc.
Flashlights and lanterns
UCO Micro (uses tealights)
Rayovac Sportsman LED lantern- These are amazing! http://www.amazon.com/Rayovac-Sportsman ... B0018S4XIS
Handcranks are nice, but they end up breaking at some point (Get some, but have other back ups)
In winter, you can melt snow, or find closest stream/pond/etc ( I am about 50ft from a large creek)
Farm animals hehe, chickens, rabbits, and a garden is great!
Solar and battery bank for simple...but can cost a bit more
Plan ahead and be prepared for anything to happen.
Think hard and read a lot of the info out there.
Heck, even set up a tent in your home/garage if all else fails.