This is my first attempted, didn't have all the photo along the steps, but still hope you enjoy it.
Step 1: Lathe
I'd missed the photo for the first step, first I drilled a 4.5cm hole with this, punched in a peace of lathed wood, glued them all, and lathed them into the shape of coke bottle.
Step 2: Cut
Cut off the two ends.
Step 3: Grind
Grind the ends into proper shapes.
Step 4: Add the Flaps
I used Purple Heart wood to make the flaps, cut three trench 120 degreed apart and glued them in place.
Step 5: Finishing
Sand the surface and used varnish to paint the serface.