On cruises where I've actually gone to the main dining room every night at the main seatings, Usually they will ask if you want bar service. A server seperate from your waiter/ assistant waiter brings the drinks. Then learn very quickly if you imbibe or not. If you have the same thing every night, they'll ask if that's what you want.
If you usually order wine, they will send a 'wine steward' to help you.
Usually the bar server comes around with a tray with the 'shot of the day' at dessert time in a glass that you get to keep (for a fee of course)
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