the only thing that will stop you dead is a busted wheel.
take spokes, maybe three for each length (you have the same length spokes on each side for the front wheel but if you have derailleurs you will have different length spokes on each side of the rear wheel) plus spoke key and something to get the cassette off: there is a Next Best Thing available: weighs nowt, works well. you can get them
here
if you don't carry one, when a spoke breaks (which they do sometimes) you'll regret it for a long time.
And yes, I know you can get a bus to the next town.
If you're on a bus route. You could call a taxi, if you had a mobile signal. And
if your phone had a charge. And
if you knew the phone number of a local taxi firm. And
if you could speak the language. In Albania?
Who looks after the bike while you're gone or do you think you'll just throw it into the back of a passing taxi? I had two spokes break on the rear wheel when I was cycling alongside a canal in France. If was a long way to the road, let alone a bus stop.
Just about the everything else likely to happen on a bike leaves the bike much slower rather than completely immobile.