I recently met a guy who'd just broken his belt drive, with no spare, and no bike shops anywhere near. He ended up hitchhiking and doing a 15 km walk with his bike to a railway station.
This made me wonder, is there any possibility of a (McGyver style) emergency repair for a belt drive, so that at least you don't have to walk or hitchhike?
In this particular case, there were small villages nearby, but no shops, so some household materials would be available with any luck.
Or maybe I should ask at lifehacks SE?