My cousins there in the open country of Venezuela tell me that nights are dark. The government cut the power, and hungry people use this to go to the farms and see what they can steal.
Don't rely on your elaborate systems too much.
I must tell you that those who rely on power and water off-the-grid, are wrong. Use it while you have it, but plan for when you stop having it. You will not be able to get supplies for your systems.
Oversize your systems; use industrial and heavy duty equipment. If you can afford buying some additional meters of extra pipe and have storage space, do it. It won´t rot and can be very useful. Design with time. Learn to get pleasure from customizing your designs, and discuss it with your family and like-minded friends over a couple of beers. I used to do this with my dad and we both enjoyed it a lot. I miss him.
The quality of the tap water is……similar to what you could get in a third-world nation. Not surprising. Therefore, I would not recommend you tie yourself to replaceable filters. Use the kind of filter that could be cleaned properly with a hard brush if needed. I would invest in UV lamps for the sterilizer and direct the money to a good quality battery pack.
A crossbow is a fine investment
I mention this because, on my wish list back in the homeland, there was a good, simple, and robust crossbow with a sight and a night vision scope. Maybe even three or four would be better, just in case. Use a tall tree for a camouflaged surveillance post, and leave the crossbow there with enough arrows to make a real mess in a roving band.
Don't get rid of that smartphone just yet, even if you have no service. Just invest in a good waterproof case and an IR heat tracing device that you may fix to it, perhaps a new battery, and you will have a wonderful device for night-watching that should last for a few years if cared for properly.
If you are skilled enough, I would suggest you try to make your own crossbow and arrows. I am not especially gifted for handcrafting, but if I have to repair my crossbow and my life and my beloved ones' lives depend on that… you get it.
A simple sheet of 3-4mm or thinner steel will give you plenty of tips. You can store them also, and they are cheap, too. Oil them and they won't rust. So making your own even if you are a couch potato (like me, sometimes, at least LOL) will provide you with an additional edge. No thief that is trespassing on your property at night is aware that an arrow will cross the night silently to get stuck in a tree one or 2 meters away from their chest. It should work as a deterrent, and a very good one. Worst case scenario, this will make them much more aggressive the next time they decide to trespass, and you should be prepared to respond accordingly.