Cruise line brochures should have a detailed list of EVERYTHING that IS and IS NOT included in the price you pay. This is usually under the title of GENERAL INFORMATION. Have a good read. I would have thought it might have been a good idea to find out exactly what you are paying for BEFORE you booked your cruise though? Please check that ALL drinks are included in the price that you have paid! Happy cruising.
It includes all food and drink onboard.