Beverages are harder to categorize than solid foods because liquid products move freely between shelf-stable and potentially hazardous depending on pH, water activity, processing method, and — for fermented drinks — alcohol content. South Carolina's Home-Based Food Production Law permits beverages that qualify as nonpotentially hazardous: drinks with pH ≤ 4.6, very low water activity, or that have been processed to eliminate pathogen risk.
The key question for any beverage is: does it support the growth of dangerous bacteria, mold, or yeast at room temperature? If yes, it's a TCS (Temperature Control for Safety) product and falls outside the cottage food law entirely, requiring a retail food establishment permit from SCDA. If no, it may qualify — with the right production method and labeling.