If it’s alcohol free, it’s alcohol free. There’s nothing to report since they’re not getting intoxicated on the job which is what all employers care about. The packaging is irrelevant.
Kombucha and various sparkling beverages come in similar packaging too, yet they’re non-alcoholic.
Reporting a colleague for the type of packaging they’re drinking from is a bit over the top and a non-issue.
Unless they’re truly intoxicated or the drink contains alcohol, I suggest you mind your own business.