I think water is best, but hot chocolate is good if you want a crazy party.
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Depends on the kind if party. Kid's party? Juice, water. Teenage party? Soda, water. (We all know alcohol gets in as well at some point) Adult party? Alcohol, coffee, water. Tea party? It's in the name. :P (I throw in water with all of them, it's just good to have as an option)