Assalamualaikum

I have non muslim friends and as they are non Muslim some of them have jobs that would be haraam if they were Muslim. If they have, say bought some food and asked if I wanted some of it, knowing that the money they used was most likely from their job would it be permissible to eat it? Furthermore, would meeting them be impermissible as they would have used money for the bus.

Jazzakallahu Khair