Here is an primer on the topic.

Of course, the regional effects of end stage capitalism that most of the western world now gets to experience will most likely at least match the fallout of said events. Still, globally there will be a lot of suffering and we will all be depper in the water, so to speak.

As to how to prepare? I can't really tell. I'm building up a stockpile currently, but the usual climate resilience rules apply. Of coursey minimize your footprint, but also build a local community, try to optimize growing etc.

The cheapest loaf in Aldi. I wonder if its better or worse for you than the more expensive ones. Cheapest ingredients but also less stuff added to it to change the texture of it.

I have mostly stopped eating supermarket bread though. It probably isn't very good for you and its cheaper to eat oats.

So now my lunches are oats I grind up at home to a coarse flour, dried fruit/nuts and just add some water. Although lately at work I use the free milk in the fridge because its cold.