I was assuming that the source of the canned goods was a supermarket or warehouse, rather than an individual having made more than a few months of provisions. And what do industrial distributors put in glass nowadays? Coke, jam and peanut butter; and even that's not properly pasturised (mind you, we can melt the jars down later, for window glass for the previous question. And, if the supermarket had wine, even stained glass windows are within consideration.
Glass is easy, if you only want to get light through it, not see. It melts before iron, so you can prepare it in a cast iron saucepan over a gas flame, broken window glass, soda bottles, broken tumblers (not plate glass), then pour it into a baking tray - nasty, bubbly translucent slabs but functional. If you don't have the lead float method, adequate. Blowing it's a bit more difficult (although window glass was long blown in cylinders, and flattened out to make windows).
Glass is easy, if you only want to get light through it, not see. It melts before iron, so you can prepare it in a cast iron saucepan over a gas flame, broken window glass, soda bottles, broken tumblers (not plate glass), then pour it into a baking tray - nasty, bubbly translucent slabs but functional. If you don't have the lead float method, adequate. Blowing it's a bit more difficult (although window glass was long blown in cylinders, and flattened out to make windows).