Water and milk.
They only get juice for our Muffins with Mom event, Donuts with Dad event, and huge Christmas party. All are events the parents are in charge of them at and I don't have to worry about sugar highs or lows since they take them home right after.
My own children? Water (or almond milk in smoothies). That's it.
My oldest used to buy himself sodas when he was out and about and I'm sure he has them in his fridge now that he lives on his own. But, in our house? You get water.