How would a crystal vase do? You could throw it back up on the mantle piece after cleaning.
You have to be careful with otc ghetto glass because every bottle is different, I've looked at hundreds. Things I've noted are:
uneven thickness of the base
fractures or folds in the glass on the base during blowing
very green through the glass signifying a lot of airbubbles
those three are the ones that should make you think twice.
Like, you aren't going to find perfect clarity in coke bottle crap, but look at heaps of coke or beer bottles, SOME ARE BETTER THAN OTHERS, choose the best one after looking at a lot of them.