If you need to warm milk, hot water is available in any of the bars and restaurants so you can warm a bottle in a bowl of hot water.
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To do this, you could use a travel bottle warmer. These come in various designs, including one that plugs into your car's cigarette lighter. Or take a flask of hot water and a large plastic container. Then just put the hot water from the flask into a container and dip the bottle in, with its cap on, to warm it.
guests agree not to bring alcoholic beverages of any kind on board for consumption, except one bottle of wine or champagne per adult of drinking age (no larger than 750 ml) per voyage, which will not be subject to a corkage fee if consumed in the stateroom.
Water is always free of charge on most cruise ships. You may be asked to pay a fee for some versions of bottled water. However, you can likely ask for a jug of iced water in any restaurant or bar for no added cost. There are several water dispensers present on a cruise ship so that you can help yourself.