I don’t believe that there is any drink that you can order at a bar if you don’t have a beverage package, Unless you are willing to pay for the drink, one at a time.
Complementary drinks in the buffet include coffee, tea, hot chocolate packet, lemonade, juice drinks, and iced tea. At breakfast, you can probably also get oat milk and soy milk and maybe they have those at lunch too—I have not looked. Also, at breakfast, you might be able to get tomato juice and cranberry juice. these will not be in dispensers, and you may have to ask for them.
The aqua spa Café will have some of these drinks as well during breakfast and lunch. And the MAST grill, poolside, will have SOME as well.