Manual can opener......
is there any other kind?
Not in my house. I did have an electric one for a few years (it was a gift; I wouldn't buy one myself) that I used occasionally until it finally died.
Manual can opener......
is there any other kind?
I used to get on well with the chap who delivered the heating oil to my place in Scotland, all of these vehicles oil and petrol are fitted with tracking systems, sometimes multiples thereof, so if as the OP has suggested Urban areas are under the control of an invading force or martial law it is likely that the tracking systems are in the hands of the 'enemy'.
So, i'd suggest having an old bedford truck filled with bowsers (something owned communally with your neighbours), rendezvous with the petrol truck some distance from home and drain as much as you can before hoofing it.
As to the OP's question.
I'd take my leatherman. All the other tools I'd need I can pick up as I walk or drive out of the city.
Manual can opener......
is there any other kind?
My pick