Adjust the size, angle and levels of the bottle cap and position it to its right place.
Press ctrl+alt+shift+E to merge all visible in a new layer. Duplicate this new merged layer and change its blending mode to 'Color doge' with 45% Opacity.
step 17 of 20
Duplicate this layer and colorize it to reddish color. Then change its blending mode to 'Hue' with 75% opacity.
step 18 of 20
Create a new layer and give 2 big soft brush strokes on top and bottom with dark reddish color leaving middle area empty. Change the blending mode of this layer to 'Lighter Color' with 20% Opacity.
step 19 of 20
this was before updating the entry.. this is more reddish so changed it to more cola color in the updated image.
step 20 of 20
Added ice cubes.
Thanks to Kyle May for the ice cubes image.