There's probably quite a few places that would take gold for a sandwich...assuming they knew what you were giving them was real gold. Gold is not as widespread in use as it once was for commerce, but it's still used.
Not the best list, but still: https://www.toptenz.net/10-post-apocalyptic-currencies-more-...
Or do you keep it in a vault in your house along with two years’ rations in case the world’s electricity stops working?
I don’t mean to be rude, but let’s try to keep the arguments rational. I’m happy to be convinced otherwise about bitcoin’s value. But I need to be convinced.