On Royal Caribbean, if one adult in a stateroom purchases the Deluxe Beverage Package (the unlimited alcohol package), all other adults (21+ years old) in that same stateroom are typically required to purchase the package as well. This policy is strictly enforced to prevent "sharing" of drinks. However, there is a common workaround for those who have a valid reason why a second person cannot drink alcohol—such as pregnancy, being a recovering alcoholic, or medical restrictions. In these cases, you can call Royal Caribbean's customer service or visit the Guest Services desk on the first day of the cruise. They will often allow the second person to purchase the Refreshment Package (non-alcoholic) instead of the full alcohol package. If you are sailing solo in a cabin, you can absolutely purchase the package for just yourself without any issues. It is always recommended to buy the package through the "Cruise Planner" app before your sailing date, as the on-board prices are significantly higher than the pre-cruise discounts.