Put 1 tray or 2 cups of ice in blender and crush. Set aside
Add Cherry Kool Aid, 1 cup club soda and 1/2 cup sugar to blender and blend for 15 seconds to combine.
Add crushed ice back to blender and blend for 5-10 seconds until syrup is incorporated into ice.
Fill cups about 1/3 of the way up with slush and freeze for an hour
Repeat steps 1-4 but instead of Cherry Kool Aid, use lemon juice.
Repeat steps 1-3 but use Mixed Berry Kool Aid.