During the recent Iberian Peninsula Blackout, which in practice meant a whole day without power and most of it without water, thanks to a past phase of mine as a bit of a prepper I:

• Had a windup radio which I used to keep up with what was going on and some entertainment-
• Quickly concluded that the water supply of the city I live in was likely to get compromised because the pumps are powered from mains so the first thing I did when I got home was fill a bunch of containers with water, most of which I ended up using. Also I already 10L of drinking water stored just in case.
• Had some freeze dried food so wasn’t worried about running out of food (though 1 days is not enough to empty normal food reserves so much that you ended up having to use that).
• My habbit of having some cash with me meant I could buy a bit of extra food from a local grocer which was open at the start of the blackout.

Anyway, my point is not to go full prepper, my point is that some elements of that minset and practices will cover the kind of far more common problems with will leave you without power and water for a few days.

One thing I did find out is that I probably need something like a solar powered powerbank for loading my tablet since that’s how I mostly read books nowadays (didn’t actually need one in this blackout as it was of just a day), so I’ve ordered one.

Little things that mean you don’t actually get unecessary stress in a situation like this.

It’s not something that is going to save you from nuclear holocaust or in general the collapse of human civilization, but it will save you from spending days without food or water or the stress of not knowing what’s going on, such as in such a long and unsual blackout, a flood or other similar more frequent catastrophes.