Depending on the length of the party, plan on providing 200 cans or 20 2-liter bottles for 100 guests. If the party will last longer than two to three hours, add an additional serving per guest each hour.
A party planner who provides other beverages in addition to soda may reduce the recommended quantity of soda in half, unless the guest list includes a lot of children. In addition to soda, plan on providing a pound of ice per person in moderate weather and cups if serving from 2-liter bottles. The recommended blend of soda flavors is 50 percent regular, 25 percent diet, and 25 percent fruity and caffeine-free.