Do you want it on the rocks? = Do you want it with ice?

Do you have any house specials? = Do you serve anything that is special to this bar/cafe?

Would you like to start a tab? = Do you want to continue to drink?

Do you have any snacks? = Do you have any food like peanuts, biscuits, crackers etc?

How would you take your drink? = Do you want milk / ice / cream etc with your drink?