it depends on the restaurant. 50's PT and Concourse let us try any non alcoholic speciality drinks, except the glow cubes, like smoothies, floats, shakes, flavored soda, etc.
LeCellier, Kona, Raglan Road, Coral Reef, Chefs de France, Jiko all just included tea, coffee, soda.
Our waiter always told us exactly what was covered each time =)