I recently made a tiered cake with a wine bottle on the top. Initially, I used a cookie cutter and made a bunch of little cakes to stack up high for the wine bottle. It ended up bowing at a little at the bottom which I was not ok with...so I scratched that idea and instead molded the bottle out of rice krispie treats. Then covered with fondant. Stacked as I normally would a cakes, with a long wooden dowel supporting the wine botle. It was so easy! And I was surprised by how much people enjoyed eating the treat, it was almost more of a hit than the cake! Good luck!