Depending on servings needed....just use a quarter sheet or half sheet. Quarter sheet would look better. Google a bottle and make a template...or just free carve it. It's not that bad of a bottle to free hand.
Take what you carve off and put on top so it's not a flat bottle. Have fun!
Thank you. I have carved a lot of cakes in the past, but sometimes it's the simple things I get nervous about lol.