Yes. Any liquids you bring are expected to be carried on. Will the porters take them? Sure - they'd slap a tag on anything for a tip. But the rules are you have to carry it onboard with you. If you put it in your luggage and it breaks/pops and ruins other people's luggage, you'll be responsible for repairing or replacing the damaged items.
There has never been a problem. I have been on a Disney cruise before as well as numerous other lines including Transatlantic and River cruises. I keep it in my CPAP carrying bag at all times
My DH needed distilled water on our cruise 4 years ago, but doesn't use it any longer. They brought us a jug of the stuff because it had been on his profile from those other cruises. We just sent it back. But there's no charge anyway.
My wife used to use a CPAP machine. We did a B2B and were given a gallon jug of distilled water at the start of each leg of the trip. Way more than we needed.
There has never been a problem. I have been on a Disney cruise before as well as numerous other lines including Transatlantic and River cruises. I keep it in my CPAP carrying bag at all times
But do you take it to Guest Services to be checked? I can't speak for other cruiselines, but on DCL an extension cord is on the list of prohibited items; for an exception to be made it should be taken to Guest Services and inspected. Fire is a serious safety threat onboard ships and older or damaged electrical cords are a major source of concern. Please just have it inspected.
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