The BF buffets we did on our last trip (Play N Dine, CP) included both juice and coffee for myself. And my son had both milk and o.j.
The Dinner buffets we did (Cape May, CM) included soda which I ordered when we were seated, and then we received coffee service at the end of our meal. My son had juice with dinner and got a milk when we went up to get our dessert.
The TS on the other hand included only 1 non-alcoholic drink with the meal.