I was suggesting it as an alternative to pewter for Cider drinkers. Would horn hold up under the acidity of Cider?

Antique pewter - I would not drink from. Just as I won't put consumables in glazed pottery (cups, mugs, bowls) from China because there are no regs on lead in glazing.

I got bagfuls of natural stupid. I don't need to go augmenting it with poison.