I chatted with an agent today and it seems the BOOKING needs to have been made during a certain window (September - December 2022) and that's what determines whether or not the water will be included.
So even though it's listed as part of my current package when I compare, it's not listed as one of my Perks in my summary, nor is it on my confirmation documents (as a promo code or otherwise) because I will not be getting them since I booked over a year ago. I think that's why there is so much confusion.
