I have always thought prepper stuff seemed too immediate focused. Like a bug out bag that you need for your immediate survival for the next 3 days. It sounds "fun" for gaming, but it's also not realistic.
Beyond the immediate 3 days, you better have a source of food. And I don't mean foraging for MRE's or going all hunter-gatherer. One of the first things I would do is start gardening. That implies I need lots of people. People to farm and people to defend it. How do you do that? By hopefully finding some people you can trust.
Farming land is a precious commodity. It needs to have a steady supply of water which hopefully doesn't flood easily and doesn't suffer from droughts. An underground spring would be ideal for this. Being easily defensible would be another boon.
You'll also need draft animals. Animals for transport, and animals to plow the land....because who knows how long the fuel will last, and I don't think we'll be getting electric harvesters or plows any time soon. Speaking of which, you might want to stock up on old school lanterns. If you can learn how to make rope, you can make wicks. Not to mention making ropes is really useful.
I would also stock up on books about herbal lore so you can craft the best medicine you can. Books on farming, animal husbandry, textiles and pretty much anything 19th century you can get your hands on.
The great irony is my mom grew up in a household without electricity, AC, hot water or indoor plumbing. She grew up on a farm where they used water buffalo to plow the dry land for the rice, and my lolo (grandfather) built his house with his own hands using hand tools. My mom has survival skills I can't even comprehend, though admittedly, they are more in line for a jungle environment (she's from the Philippines).