The two big tasks we use energy for - heating and cooling...
I had heard about Zeer pots a while ago - I just hadn't quite realised how easy they were to make - a couple of terracotta pots, some sand, water, and a place out of the sun that has a bit of breeze. If you haven't heard of them, look them up - a very low tech way of keeping things cool by evaporative cooling. The idea has been around for ages, but they've been picking up in the last few years. Keeping food cool is a game-changer for places where you can't get electricity or fuel to run a generator... PSHTF, for example.
Alright, you ideally need low humidity and a good breeze, but...
I've also been looking at rocket stoves, and whether I buy one or try making one. The obvious solution is to buy one, so that at least I have one working one, then try making. The problem with making is that you need to get the tools, hardware, and components to make one - which is why civilisation really took off when we could afford to support people spending their time doing one particular job.
I still have to solve my water supply problems, though.
On the other hand, this season has seen several trees being planted, some in pots, most in ground. A few new trees acquired - ones with a high tolerance for hardship. I also found out about a native tree, very hardy, that is an indigo - and can be easily used to dye. Depending on the process, it does a yellow/light-brown, apparently can also produce a very rich blue and a red, again depending on the process used. I've found a nice, low shrub, which produces edible berries, and can be used for craft purposes.
And, a lot of other plants on the grow. I'm trying growing sorghum, apparently it is has lower water requirements than a lot of other grains...
Much to do. How much time to do it in... I don't know.