The candied alcohol of vodka or rum mixed with the Starburst candies can be stored in an airtight glass jar or container like a mason jar in the refrigerator for up to 5 days. When you’re ready to serve your cocktails, simply add the ice, candied alcohol, juice, and soda.  I wouldn’t suggest trying to freeze your candied alcohol as a storage method if you use vodka. For one, vodka doesn’t freeze solid in most freezers due to its very low freezing point. In addition, storing vodka in the freezer can potentially mask the alcohol’s subtle flavors, depending on what you’re using.  If you use rum for the candied alcohol mixture and want to store this in the freezer then you could do so by freezing it in an ice tray or in a freezer-safe jar or container for up to 6 months.