3. use sandpaper polishing around in the middle of the bottle. Deep, about 1-2 cm so that the Silicone adhesive to the better bottles, then take a bottle of water, 1.5 liters to put in every pie box.
3. Use the sandpaper around the mid to deep water about 1-2 cm to silicone grip on the bottle better. Of the 1.5 liter bottle of water to put in the circle dug.
3. Use sandpaper to polish the area around the central bottle deeper about 1-2 cm. In order to silicone adhesion to the bottle. The bottle of water 1.5 liters. To enter dates in circle drilling.