well...
that is smart Dave.
water collection and purification is pretty darn critical.
having one's own garden to produce food is up there too..
all one needs to feed a family of 4 or 5...is a 1/4 of an acre garden, and that will grow a years worth of produce.
Cold storage for fall vegetables and fruit is a good idea ...
If a cold cellar is dug under the ground level...root vegetables stored in such a room last longer (odd isn't it?) than in a refrigerated storage, and is cheaper on electricity.
Canning is a great hobby, and well worth taking up.
When summer vegetables are harvested, canning the bulk of them so you can have virtually fresh veggies and fruit in the winter is cheap and tasty,
I grew up learning all this on the farm, and my mom and grandma were always canning when harvest time came...

The stories my mom and grandma told of how hard it was for people during the depression, and after the wars, how they felt lucky, that even though they didn't have a lot, the farm and all the produce they brought in, paid the bills and kept everybody fed, and they helped their neighbours.
I think there will be more of that happening, soon.

I think it only a matter of time the whole idea of a "separate isolated bubble life" will be popped and ending...
people who can help one another like communities used to do will be on the rise again as times get tougher.
Those with practical skills that can help others are also good in trade.

and yes, a power supply is handy, solar in a pinch for basic charging and lighting is fine, but unless one lives in a sun-lit high exposure part of the planet, it is not to be solely relied on.
Most northern climes need wind power and / or other combinations to produce enough power for daily life needs , at a minimal output.
Best is having a consistently running body of water nearby, put a pelton wheel on it, get the batteries one needs and an electrician in to wire it to ones house, and that has always been the cheapest, most effective way of producing power that can provide enough, with little breakdown problems as well.

It is never a bad thing to be able to be prepared for emergencies.
Whether it is power outages from storms that may last only hours, days or weeks, to the collapse of civil society .. it doesn't hurt to have a preparedness plan and work at it...good hobby unto itself.
My point of view...I think you are being prudent Dave.

concerning the "powers that be"...and moves they will make trying to grab what they can...
Thing is...it is like 2 sides of a coin ..
1 side is a stable economy providing resources and stable currencies...to afford the other side of the coin, the military.
you need roads for the military. you need stable running infrastructures, of all kinds as well.
The global economy falls apart for whatever reason.
The military of the planet won't last much longer afterward.
Gotta pay troops, gotta feed troops, gotta clothe troops.
Then there is the equipment, gotta make sure replacement parts can be made for literally everything.
Hell, height of the cold war, the life expectancy from just running the state of the art tanks through terrain was 3 days in war time. I think the running lifespan before breakdowns start was a few weeks , months...
So the power grab by these powerful countries with their delicate and highly technical equipment will be short lived.
They won't have much time.
So I wouldn't be too worried on that front.
I would be worried AFTER the "Powers that Be" fall apart, and the world has little in the way of law and order.
For a few weeks , even perhaps months, all should be somewhat ok.
But then the city people who don't really "produce" anything ...are going to start getting hungry as the food starts drying up.
I am sure before that begins to happen, many cities may try to take over many farms in out lying areas to produce food for them, but ...a few farms are not going to produce food for millions in a single city.
It will get grim, fast, if civil society collapses.
It will be the first few years that will be toughest.
With roaming people who have no skills a community would need... taking what they can...I am sure....
Not too pleased with the prospect.
It will be a nightmare ...
It shouldn't be too bad here for me...on Gabriola, but some from the city a few miles away, will try to take boats I am sure, to come across and grab what they can...
It would be a weird time here..

This being a long post, I will answer your question to me in the next I write...