The Illinois Liquor Control Commission issued a FAQ solidifying their position that cocktails to-go is not allowed.

ILCC FAQ

Specifically, the ILCC states:

The State Commission has authorized retail licensees, subject to local approval, the privilege of
selling alcoholic beverages for off premises consumption. The only caveat is that the alcoholic
beverages must be in the “original container” (or growlers/crowlers sold pursuant to 235 ILCS 5/6-
6.5). A retailer may sell a “cocktail kit,” which would consist of a non-alcoholic cocktail mix, such
as margaritas or bloody marys, and an alcoholic beverage in the sealed original manufacturer’s
container. The important factor is that the alcoholic beverage is sold in the sealed original
container (or growlers/crowlers sold pursuant to 235 ILCS 5/6-6.5). Pursuant to 235 ILCS 5/6-6.5,
growlers or crowlers may only be filled with beer. Please see the “’To-Go” Sales and Delivery of
Premixed Cocktails” guidance document on our website for additional information.