What is the base liquor in a Watermelon Shooter?

The base liquor in a Watermelon Shooter is vodka. This choice aligns with the traditional composition of the shooter, as vodka serves as a neutral spirit that allows the flavors of the other ingredients—typically watermelon-based liqueurs or purees—to stand out. Vodka's mild flavor complements the fruity elements without overpowering them, making it an ideal base for a refreshing, dessert-like shooter that highlights the sweet and juicy profile of watermelon.

In contrast, rum, gin, and tequila each possess distinct flavor characteristics that may not blend as seamlessly with the watermelon components, potentially altering the intended taste experience of the shooter. Thus, vodka is the optimal choice for achieving the classic flavor balance in a Watermelon Shooter.