No matter how much "stuff" you've stockpiled, there's never going to be enough in a long-term situation. Things get stolen, spoiled, left behind, or lost. Stuff is good to have but nothing can replace skills.

Can you start a fire to keep warm or to cook with? Can you do it without lighters or matches? Can you do it no matter what's not available? If not, this is a skill you need.

And there are more.

Finding and purifying water is another. As is hunting, gathering, and gardening. Tracking may even become essential.

And repairing tools and equipment. That's a big one if you want to keep things easier than they will otherwise be. Even more empowering is the ability to make new tools.

Blacksmithing is like a superpower in a permanent grid-down situation.

This doesn't mean you shouldn't stock up on stuff. Nothing will show you the value of a lighter faster than having to do without one for a long time. By all means, stock up on them and stash them in a variety of places. But know how to make a fire if you don't have one. And practice this skill.

Practice every skill.

Think of other skills you can learn which will make "stuff" less essential to survival. Feel free to share your ideas. Learning from others is another skill too many people neglect.

Every skill you learn will make "stuff" less critical.