It was actually super simple to make! You'll need:
One large container of Welch's Grape Juice (It has to be Welch's or you are not going to get a good purple.)
One large container of pineapple juice
One 2 liter of Sprite (We used Sprite Zero.)
Mix everything up together in a large bowl and serve cold!
We made some punch ahead of time and poured it into ice cube trays and made punch ice cubes to put in the punch bowl so that the punch would not get watered down from regular ice cubes.
So yummy! I wish I had a glass of it now!
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