My whole family was born with a sleep disorder called sleep apnea. Simply out, our throats relax too much as we drift off to sleep causing us to choke and wake up repeatedly. The solution the problem is to sleep with a CPAP machine which is a fan connected to a mask and the mild air pressure keeps our airways open throughout the night. One issue with the machine is that it can make your mouth get as dry as the Sierra desert and they have solved the problem by adding a small water reservoir to the machine so that it blows out air with a high humidity level. It's important to use distilled water specifically because this is water that's going directly into our lungs. How would we go about requesting to bring a gallon or two of distilled water on board the cruise ship as a medical necessity?