The first step was to drill a 10mm round hole into the rear of the bottle using a diamond cutter drill bit - this isn't easy as the glass is thicker in some places than others and can be prone to crack. Then I used a white grommet with a 9mm internal diameter to seal the cut edges and allow me to feed through the LED lights.
The next step was to feed the LED lights on wire through the hole, taking care to get the lights evenly balanced within the bottle - it helps to pull the end out of the neck and maneuver the lights around to get it evenly spread out. When I was happy with it I then sealed the end of the battery compartment into the grommet using superglue.
The final stage was to seal the neck of the bottle with a Coca-Cola red cap, using superglue to seal the cap to the bottle.
In total it took about 20 minutes to create each one and I have used different color LED lights with CR2032 batteries as this gives the longest life for the bottle light. Its quite unique as I haven't seen anyone do anything like this before.