If you're only referring to the ship, they seem to be waffling on that. They never used to bother with water and pop - I used to take at least a 12 pack of coke at one time and never had a problem, but now I'm hearing they are confinscating water for sure - not sure about pop. They have added a disclaimer about not allowing pop and water except for whatever you happen to be consuming as you arrive at port.
I would think you wouldn't have any problem with a liter of pop.
Celebrity Constellation - March 17 followed by Celebrity Reflection - March 22
44 cruises - too many to list however cruiselines are in no particular order:
and some unknown tub
Yes, I'm a Royal Chump and proud of it.