Black Lagoon Punch

This one came from AllRecipes it comes out brownish, but will look darker in a colored serving bowl. This one is particularly effective for showing off ice molds.

1 (.13 ounce) envelope unsweetened grape soft drink mix
1 (.13 ounce) envelope unsweetened orange soft drink mix
2 cups white sugar
3 quarts cold water
1 liter ginger ale