You don't survive an apocalypse like that. In the universe of that show it is unlikely, unfathomable really that they'll ever return to the world they knew. Even building a new society will be impossible. With such a dim future ahead people will always go crazy.
Not sure about that.
These undead, are a temporary thing. They'll thin out. Its about surviving, and this works best with a group.
I would try to look for a large fenced area with a green zone in it. Like a football stadium, or military base.
First, repair and develop an actual impregnable wall with a gate that can withstand 50 people pressing onto it. Survive on canned foods.
Set out to scavenge for seeds, develop agriculture and try to get chickens (egg protein), perhaps larger.
Find a fishing zone, set up a watch tower, set up a secure perimeter.
Scavenge all the fuel you can.
Its about outlasting these zombies, they are not there forever.
And yes, i took that stadium example from Fallout 4