1.) 1 package of sugar free jello
2.) add 1 cup boiling water
4.) add 1/2 cup rum or whatevah and then 1/2 cup cold water. You can add more rum or liquor if you'd like and add less cold water (as long as everything equals one cup).
basically you are just substituting the 'cold' water on the package for liquor.
note: all I had was paper cups but these work much better in small plastic ones, or grab a spoon!