What extras are you referring to? The excursions, Palo and spa appointments? If so, they are paid on the cruise. Each has a deadline by which you need to cancel to not be charged. The excursions are three days prior to the cruise. Palo and the spa are 24 hours in advance.
Oh and where in the prearrival kit did it say not to pack beverages? The only thing I saw was about beverages in coolers. You are not supposed to bring on coolers unless it is for medical reasons.