One of the outstanding items as I have worked on The Collapse is that I have never really had a sense of what Seneca (The protagonist) actually owns. Yes, I have some idea in my own head but realized that if I was going to write a credible story, I needed to actually decide what he had, because that would be all that he would start out with.
(This reflects one of my personal pet peeves: authors who simply throw items in that have previously not been accounted for or explained. J.R.R. Tolkien always made sure there was a link for everything in his books; Robert Jordan (The Wheel of Time) was not very good at it - to the point I stopped reading his books).
And so, I started making a list of everything Seneca had: Personal, Cooking Utensils, Armory, Tools, Food and Supplies, Livestock, Garden, Fishing.
Some of the thing I wrote down (mostly personal) reflected things that I own (after all, he is an extension of me to some extent). Some of the things extended from what I have described of him: he has a wood stove, for example, so it follows that he would have certain implements (maul, ax, sledge hammer) to prepare the wood. In some cases where a specific reference had been spelled out, I used that number.
After I initially completed the list, I looked at it. And was totally surprised at what I thought someone who was trying to be "grid-less" actually needed to own. It was a lot more than I anticipated.
To some extent, that is the way of life, is it not? We start something, then find we need three other things in order to do it - or that the one specific tool for the task would greatly increase our efficiency. Or realize that doing it "ourselves" initially costs a lot more than we anticipated.
Even a moderate amount of self sufficiency, at least in fiction, is a lot more complex than it seems.