Measure out 1 cup of pickle juice. Fill 2 cups with ice. Have your packet of fruit punch Kool-Aid ready. Optionally, slice a few pickles for garnish and set them aside.
In a blender, combine the pickle juice and ice. Add the packet of fruit punch Kool-Aid to the blender. Blend until smooth and slushy.
Taste the slushy mixture. If desired, add 2-3 tablespoons of sugar, adjusting to taste. Blend again to mix in the sugar thoroughly.
Pour the slushy mixture into cups. Top with pickle slices for garnish.
Sprinkle Tajín or additional sugar on top of the pickle slices, if desired, for an extra burst of flavor.
Serve immediately and enjoy your unique and refreshing Pickle Slushy!