Hi Gina!
Welcome to the Disney Parks Moms Panel! Are you getting ready to set sail on another Disney Cruise? Being a fellow person from Illinois, we enjoy taking cruises in January, too! There's nothing better than escaping the freezing cold Chicago winters by embarking on a voyage sailing the high seas with Captain Mickey and his friends!
I think I know what portable water cooler you're referring to! I seem to remember seeing it sold on our previous cruises when we disembarked the ship on Disney's private island,
Castaway Cay. I believe a Cast Member was selling them as soon as we stepped onto the island, close to where you can grab beach towels for the day. I checked out the
Gifts & Amenities page on Disney Cruise Line's website and currently see a Star Wars Cooler as well as a Frozen Cruise Cooler that are both exclusive to Disney Cruise Line and available for purchase in advance of your voyage! They're both very cute!
If neither the Star Wars nor Frozen-themed coolers are what you had in mind, I suggest revisiting the Gifts & Amenities page before your voyage because the merchandise often changes! If the particular one you're remembering doesn't turn up on the Gifts & Amenities page, hopefully you'll see it sold onboard, or at Castaway Cay, during your next voyage!
Beth