Sustainability is a wonderful goal that I suspect is never actually reached.
I look at our own situation and think that we are awfully vulnerable. And so, slowly, I'm working to make things better. I'm planting things like blueberry bushes, blackberry/raspberry plants, asparagus patches, and working on garden spots. I would like to work on either a cistern or water tanks that could allow me to operate solely off of rain water if the need would present itself, perhaps some pond water for garden bed irrigation. I've wanted chickens but am not quite set up for them yet. Hopefully, this coming year we can get started with that. One reason I've not gotten chickens is that I really do need to make sure I have a secure place for them and that I have decent fences and pasture areas for them. That's important. Also, I don't have the food plots set up to the point where I can grow a food just for them.
As much as I lust after "sustainable living", I know that it's probably never going to be something I'll achieve. Doesn't mean I can strive to head in that direction.
We only got a small (40' x 60') garden planted this year, not nearly what I'd have liked, but we've been getting a lot of good food out of that little garden. We can and/or freeze stuff probably 3 days out of every week. Friday was tomato sauce day and we canned 6 quarts of some of the most wonderful sauce I think I've ever had, along with that many quarts of the liquid that comes off, not exactly "juice", but a wonderful stock for the beginnings of something like soup or minestrone. (There will be more!) The lowly greenbeans and squash have been abundant and even though we get a little tired of them right now, when the garden is over, we'll be very glad for what we've preserved.
We have a house with a nice southern exposure. And the roof is aligned nearly perfectly for solar production. I do hope that at some point I can look towards at least a small backup system, at least enough to run the refrigerators/freezers indefinitely, maybe some lights, computers, that kind of thing.
So many things we'd like to do. Life doesn't always cooperate. But we're trying to at least head in the right direction.
It's interesting to read about what others are doing. I always appreciate the little ideas that crop up on threads like this. And I also find that I learn just by doing. For instance, I've learned several things that I want to do next year for the garden spaces and several things I want to do differently. I wouldn't have known had I not done what I did this year.
And though it's not exactly a "sustainable" kind of thing, I was a piano tuner / repair person many years ago. I'm planning to allow that to expand again, certainly not into a fulltime job or anything, but as an extra income sort of thing when it happens.
Thanks for those who've posted. I'm enjoying reading.