How many 2 liters should I get for a party with 40 kids and 10 adults?!
Rule of thumb is 16 oz for adults and 8 oz for kids (depending on age; teenagers drink as much or more than adults). As each 2-liter is approx. 64 oz, this comes out to about eight 2-liters. Another factor that will affect how much liquid to be consumed: hot weather, level of exertion by the adults and kids (Is this a party after a game or practice?) and food served (cake & sweets or pizza & chips).
I would buy about 8-10 people seem to drink more when it is soda
You Should Get 5 or 6 Bottels