Welcome aboard, Jaxon!
Setting sail with Disney Cruise Line in January will be a great escape from the cold weather in Illinois next month. My family and I love sneaking south for a winter cruise with Disney to enjoy the warm waters of the Bahamas and Caribbean. You're in for a magical vacation!
I'm happy to let you know that guests are allowed to
carry on their own beverages if they'd like something specific. So, swing by a convenience store and grab a six pack of Diet Pepsi. You're welcome to carry that on with your carry-on baggage as you board the ship. It may not be packed in checked luggage. If you're planning to bring alcohol, limited amounts of wine and beer may be carried on as well, but please check out the
Alcohol Policy for specifics. While there are
beverage packages that can be pre-purchased to be waiting in your stateroom, such as wines, beers, and bottled waters, I don't know of any delivery services for Diet Pepsi, because as you mentioned, only
Coke products are available onboard, so your best bet is to bring your own Pepsi.
Have fun planning your cruise, Jaxon!
Marcy