Which beverage is described as usually only coming with hot water?

The beverage that is typically described as coming with only hot water is Vanilla Chai. This beverage is traditionally prepared by combining chai tea concentrate, which is often brewed with spices, sugar, and milk, but when considering a basic hot chai, it involves steeping the chai with hot water. Therefore, when focusing solely on hot water as the primary component of preparation, Vanilla Chai stands out because many traditional recipes utilize just hot water to dilute the chai concentrate, particularly in a more simplified version.

The other beverages listed may involve more complex preparations or include additional ingredients such as milk or flavoring. For example, Sweetened Iced Tea primarily consists of brewed tea that is chilled and served over ice, while Hot Chocolate is made using hot milk or water with chocolate syrup or cocoa powder, and a Latte Macchiato combines espresso and steamed milk. Such ingredients move them away from being classified as simply involving hot water in their preparation.