Post apocalypse, what weapon?

 Any bladed weapon will do you just fine.

You won’t have to worry about ammunition, stoppage drills, noise pollution. You’ll likely need a fair bit of upper body strength, but hey, what else will you have to do ith your time apart from exercise?

The only bit of upkeep you’ll need is a bit of sharpening and maybe a bit of oil.

But if you want even more basic, there’s always the club/blunt instrument. Great for upper body strength, and even less upkeep than a sword.

Either or, whatever works best for you.

Sister Alex 

Cold Steel on the Rocks 

We Are Cold Steel 

Cold Steel and the Underground Boneyard 

It's Not For Everyone 

Charlie Scudsen, An American President