The amount of servings in a 2-liter bottle is approximately eight 8-ounce servings. Each liter contains 33.81 fluid ounces, which calculates to nearly 68 ounces in a 2-liter bottle.
When buying beverages for a large group, one can plan on serving at least 1 cup (8 ounces) per person. A party of 24 people requires at least three 2-liter bottles to provide everyone with one drink. For a two-hour party, one can plan to serve three drinks to each guest.
To stretch the number of servings, the host can reduce the serving size. For example, reducing the serving size to 6 ounces yields approximately 11 servings.