Lemon Drop Cocktail

As seen on Food.com

Description
A bright green punch fun for Halloween.

Ingredients

 * 1 (6 ounce) package lime gelatin
 * 2 cups boiling water
 * 3 cups chilled pineapple juice
 * 1 (2 liter) chilled lemon-lime soda or ginger ale
 * 2 cups chilled vodka