Yay! I finally figured out how to make a proper cola slushie, as opposed to my last pathetic excuse for one.
One 500ml bottle of cola
1) Place the bottle of cola into the freezer.
2) After 2-3 hours, take out the bottle of cola.
3) Shake up the bottle.
4) Slowly open the bottle.
5) Pour out the resulting slush into a glass.