A poncho. You need a poncho.

There are people who live out of a backpack for months.
But, you forgo a lot of conveniences, and are usually near a store to buy relief and refills.

To survive you really need a house to sleep in and a garden to grow food in and an area to store food for the whole year. You can only do without these things for a short period of time.

Which comes to, which gear do you need?
Well, what is the mission?

Is the mission to survive for 3 days? For 3 weeks? or for 3 years?

Three days, you need a bug out bag with food and water. You will need something to keep you warm and something to keep you dry. Everything else... well, you can just tough it out.

Three weeks means a pile of food and water in a place that is defensible. Well, defensible enough.
Having a generator or a pile of fire wood is great. Light sources that are not AC powered. And some way of processing waste (which can literally be a 5 gallon bucket and plastic bags and sawdust)

Three years means a good garden. Ways to can things. A comfortable house.
And some of the most important things are grow lights and automatic watering system.

Guns are weird.
Have the size of rifle to hunt what is normally in your area.
This could range from something that can kill a bear
to a .25 high powered air rifle to scare off coyotes and rabbit dinners.

The other thing to hunt is man.
And here .... any weapon is enough. The experience of using it and moving with it is what is important.
More important than a weapon will be a group of people who will have your back.

Sooooo, the expensive Gucci Guns are usually the least important thing in any kit.