This was our experience of Billy Bob's last year in September:
"We arrived at Billy Bobs at 7:15 pm for our 7:30 pm booking and they were able to let us book in early. We used our half board standard vouchers but the value of our buffet meal with complimentary drinks would have cost us 50 Euros. Billy Bobs was one of the most enjoyable meals we had at DLP so relaxing and tranquil compared to the rest of the Resort. We purchased two additional soft drinks at a cost of 5.80 Euros. The buffet was extensive and there is something there for all tastes - we saw nachos, guacamole, cheese & salsa, chilli rice, salad, spicy sausage, spare ribs, chicken nugget, pizza. Desserts we saw were fresh fruit salad, slices of melon, chocolate mousse on a shortcake base, chocolate gateau, chocolate muffins, the most amazing lemon meringue pie and Haribo Disney sweets."
Altho having checked the menu on DLRP here it looks like you no longer get the complimentary drink???