To test your supplies, turn off your electric/water for a weekend. Live off of what you have.<<<
That is an excellent idea.
The backyard idea is for those, who plan to hit the road and try to get away.
LOL, I don’t need to do the tests, I have not been able to go shopping for years.
Of course, when one hates shopping, they tend to think ahead in stocking supplies so they will not need to go.
Do try it, it will tell you far more than you can guess, and if you have kids, make it a no tv/radio and see if you have books, etc to interest them.
I keep posting the coloring pages, as I have some printed and if I expected to see kids, I would print more and have something for them to color with.
I did that when I had a real estate office, a stack of copier papers, that I had copied interesting things on and a box of crayons, the kids colored and the parents could talk to me.
Once socialism hits the utilities I’m afraid we will be getting plenty of practical experience as far as going without electricity. If it’s working we won’t have the money for it anyways...