Tacking on to this question, the website says:
“Items such as sodas, energy drinks or other non-alcoholic items are not allowed on board in any form. Plastic water bottles are not allowed. However, an allowance of six liters, twelve (12) cans or cartons (500 ml in volume or less) or six (6) cans or cartons (1 liter in volume or less) of water are allowed per stateroom. Any amount in excess of this allowance will be not be allowed onboard. Water in plastic bottles will not be allowed onboard in any quantity, including in ports of call. Guests will be asked to discard open beverages in plastic containers prior to boarding. ”
does this mean I can bring on flavoured sparkling water? For instance, a 12 pack of Bubly/La Croix or something similar?