What kinds of drinks should i get for 16 teenagers?

I'm a sopre, and for our turnabout dance (Sadie Hawkins, girls choice dance) me and my group (16 people total) are eating dinner at my house instead of going out. Instead were catering food and my family agreed to serve us like a resturant, because it's cheaper and we dont have to feel rushed. We've got all the food covered, but what drinks should I get? I don't drink much soda so I dont know... Obviously no alcohol, but what types of sodas do most people like and how much of it should I get? Thanks :)