Total apocalipse is not possible (Earth is so large that it's impossible nuke EVERYTHING and EVERYWHERE.
But if this is just experiment "what if" those are thing that I would suggest to do:
- Forget about computers and programming and gadgets
- DO NOT STAY IN BUNKER, INSTEAD FIND FRIENDS!
- Focus on FARMING as team
- Scavending for potatoes, grain etc - for seeds!
- FARMING
- FARMING
- FARMING
- FARMING
- FARMING
- HARVEST
- FOOD = LIFE
What you really need is:
- water (well or river)
- water filter (from sand, rocks, and wood ash) for human consumtion.
- fire (easy - a lot of lighters laying around, if not use your glasses!)
- fuck cars and fuel - you are not going anywhere as you need to do FARMING
- CORN, POTATOES, WHEAT production (parts that we dont eat are perfect food for sheeps or goats!)
- SHEEPS, GOATS production (milk and meat!)
- SHELTER: there must be plenty empty houses in this scenario (everyone died!).
- Do forming for few years. Then you grow and grow.
You could sell food in futre and rebuild society,
maybe as agroculture baron. :)
OPTIONAL: [you dont need electricity as farmer!]
- electricy from solar panels ("borrow" them) or from wind (you can use any electrical engine for it! For example from washing machine :). This stuff is hard but doable.