Step 2 : Cut your doweling into 3 equal pieces.
Step 3 : Place pieces of doweling in vice and drill into the ends with a drill bit that is slightly smaller than the screw you are going to use (be careful not to split the doweling).
Step 4 : Insert the doweling into the bottles.
Step 5 : Insert the screws through the base of the bottles into the pre-drilled holes in the doweling.
Step 6 : Tape around the doweling and the bottles for extra strength and decoration.