I would imagine that anything that's in an airtight sealed container, such as chip bags, would be fine. That would also include cans. Your refrigerator and freezer, also, would probably count as a sealed container.
Smoke in a building fire can contain all sorts of weird chemicals from burning plastics and whatnot that could get deposited onto stuff, so even if you can't see any soot in your apartment I wouldn't dismiss all concerns. How tight is your budget?