Just returned from the 9-10 9-17 Symphony cruise. My travel agent requested the distilled water, but it wasn't there the first night. I asked the room steward and he went and got a gallon immediately, free of charge.
I haven't cruised for over three years now. In times past we checked in a case of water along with our luggage. Besides drinking, I use it for a CPAP. Is this still allowed?