Putting all this effort into something which most likely will not come to pass in your or your children's lifetime is not constructive and will eventually sap the energy and resource needed to stay 'prepared'.
May I suggest taking up a lifestyle at this time and more or less in the place you are - assuming you're not in some jam-packed city where all hope is lost the moment society does break down for some time (New Orleans during Katarina is a good example of what will happen)? If you do live in such a place and will not consider to move out of it this won't work but if you have some space around you which you can call your own it makes sense to start using it in a productive way by growing something useful.
Dig a well if you can, a dug well is more reliable than a deep-drilled one as you can get water when the power fails (which it does quite often where I live out in the Swedish countryside thanks to storms or careless snow plough drivers and such).
If you don't live in a forested area you can start planting trees on less productive or hard to till soil, you'll need between 2 and 4 hectares to keep a house with around 200m2 of living area warmed to today's standards, less if you make the wise decision to lower them a bit. This does assume you have a wood-burning stove and cooking stove, of course - get those and use them regularly. Plant some fruit trees, berry bushes, a plot of potatoes (which you'll have to move around year after year as you should not grow potatoes in soil which carried them the year before or the one before that), root vegetables, easy stuff. For fun and profit you can add hops which will allow you to brew beer if you can get hold of barley - you could grow it yourself but it takes a lot of land and is a lot of work if you do everything by hand. Just make sure to think in practical terms, you're not trying to relive some Swiss Family Robinson fantasy but trying to live in a way which makes you and yours less dependent on the intricate workings of society, irrespective of whether any doomsday-scenario ever comes to pass or not. The less dependent you are of the trappings of 'modern' live, the less you'll suffer for the loss of such.
I saved the best bit for the end: you'll most likely be happier in the here and now by becoming more self-reliant and less dependent on 'modern' society and its... lures. That does not mean you have to become a Luddite or back-to-the-land hippy, it just means you won't feel lost by not being part of the herd which follows the latest craze, sports the latest gizmos and relishes in the latest fad. It also means you won't need to think about 'prepping' anymore, just like people who cycle to work won't need to think about going to the gym to get some exercise as they made it part of their normal life.