Mix all ingredients (except soda) until well combined. Store covered in an airtight container in the freezer for at least 24 hours.
Use a spoon to scrape and scoop the bourbon slush into a glass. Fill about ⅔rds full and top with diet Sprite or diet Ginger Ale. Mix with the spoon to get it to a slushy consistency. Enjoy!
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Notes
Bourbon: Normally, I like really good bourbon. I have all my favorites for different types of drinks. But honestly, this does not require quality bourbon. Any kind will do here.This makes a large batch and requires a large container or bag to store it in the freezer. Plus the space to store it in the freezer.