Finally, for the yellow layer, bring 1 cup of water to a boil then add in the pineapple Jell-O™ package and 1/2 cup of vanilla vodka. Allow gelatin to dissolve and cool to room temperature. Then stir in 1/2 cup of coconut milk. Add a few drops of yellow food coloring, if desired, for a more vivid color. After mixture has cooled, add the yellow layer on top of the firm orange layer, another 1/3 of the cup, and let chill 3 hours or overnight.