As long as your not trying to bring excessive amounts onboard, they usually won't mind a couple bottles of soda or water.
Majesty of the Seas - 10/03 & 02/07 & 11/08
Enchantment of the Seas - 10/04 & 10/11
Mariner of the Seas - 10/05
Vision of the Seas - 10/06 & 09/07
Carnival Liberty - 10/07
Adventure of the Seas - 9/08
Ruby Princess - 12/09
Voyager of the Seas - 9/10
Carnival Spirit - 11/10
Oasis of the Seas - 9/13
I just got home from the Mariner on June 8th. I brought about 24 cans of coke on and about 12 bottles of gatorade. No problem. When I was coming back on from Grand Cayman, I brought on a two liter of diet coke. No issue at all.
Iam going on Mariner of the Seas next week...can I bring a couple of liter bottles of soda on? Or water bottles?
We brought a case of bottled water on board Rhapsody when we boarded several years ago in Galveston. This was for a family of 6 and they did not have any problem with us doing that. I usually bring a thermal mug and single packets of crystal light too.