Hi, Jennifer!
Sure, you can bring your own water bottles on board -- you can either pack them in your checked bags or carry them on in a daybag (not a cooler) no bigger than 22" wide, 14" high and 9" deep. However, with as heavy as I pack, I usually do one of two things:
- I pack a reusable water bottle for each member of my family to fill at the beverage stations.
- I order a water bottle package from the Gifts & Amenities Page to have delivered to my stateroom.
Although you may not be worried about extra weight in your luggage, you may appreciate having the extra room in your suitcase for clothes, shoes and other essentials. Plus, it does help ease the burden when you're loading the car and unloading at the port.
Also, you can decorate your stateroom door -- you just can't use anything sticky like tape, rubber cement, stickers or any other adhesives. Magnets works great since most stateroom doors are metal.
I hope this has helped, and let me know if you think of other questions. Have a wonderful day and a magical vacation. Bon voyage!
Andi