We acquired this from an old magic estate buy-out. Not sure of the original handling or the maker but looks like you would introduce this Coke bottle by magically producing it (from your favorite piece of magic apparatus) or by just openly bringing it forward. Then you would magically and visibly split it apart into two bottles from which you would pour a drink from both of them.
You’d have to watch your angles with this one but no different than working with the Multiplying Billiard Balls or Multiplying Candles, etc.
No instructions. You receive just the one real glass bottle (the two halves) as pictured.