Simple question. For 50 people, how many 2 liters of pop are needed? I'll have a few gallons of water as well. It'll be outdoors for lunch, high temp that day is supposed to be 79°F. My estimate was 3 people per bottle, thus I'd want 15 bottles. But, is that estimate way off? Edit: Soda (but not the confusingly similar ice cream soda drink) for the morons who don't know what pop refers to.