Which ingredient is NOT included in the preparation of the Tito Mega Mule?

The correct answer indicates that soda water is not part of the Tito Mega Mule's preparation. The Tito Mega Mule is a variation of the classic Moscow Mule, which typically consists of vodka (in this case, Tito's Handmade Vodka), ginger beer, and lime. Ginger beer provides the signature spiciness and flavor, while the lime wedge adds a citrusy brightness that complements the drink.

Soda water, however, is not traditionally used in a Moscow Mule or its variations, as it would dilute the distinct ginger flavor that makes the Mule enjoyable. This distinguishes the Tito Mega Mule from other cocktails that may incorporate soda water as a mixer. Sour mix is also not a typical ingredient for a Mule, thus reinforcing the understanding of the specific components that characterize this beverage.