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Most natural gas appliances can be converted to propane. I know for cook stoves, it is a simple matter of adjusting the flow arbors. You can install a t-connection, with a propane line connector, and simply switch over if the gas stops flowing. There are also economical, wood burning, free standing, stoves, that would require an exhaust vent installed through an exterior wall. They do a great job of heating. Depending on how your gas appliances are exhausted, a y connector, with a damper, may allow you to use them, without having to cut additional holes. Either way, stock up on propane/firewood. Generators are fine, for short term use, I would not recommend depending on them 24/7. For one thing they make noise, which could draw unwanted visitors, to "share" your well lighted home.
You will also have to consider, your toilets, and bathing when determining how much water you will need.

There are several brands, of long term storage foods, available, and it just a matter of personal tastes. Dried beans, rice, canned goods are also good for long term storage, but growing your own food may be something you want to consider. potatoes, can be grown in a 55 gallon can. many other foods, require minimal space to grow. Learn to can your own fruits and vegetables. Buy extras when you shop, just for canning purposes.

While it may seem like a good idea to sequester yourself and your family, it is better if, in the event of a grid down situation, to have a community of like minded people, who can share resources, and expertise. Hopefully your neighbors and friends are of the same mindset, and you can work together, form communication chains, and each take on certain responsibilities, in the event of a fecal matter contacting the rotating turbine situation. JMHO