When traveling in 2026, medical experts and device manufacturers still strictly recommend using distilled water in your CPAP machine's humidifier. Distilled water is the only "pure" option that is free of the minerals (like calcium and magnesium) and microorganisms found in tap or filtered water. If you use tap water, even for a few nights, you run the risk of mineral buildup (scaling) in the water chamber and potential bacterial growth that could cause respiratory irritation. If distilled water is unavailable at your destination, you should use purified bottled water as a temporary 2-3 night substitute, but you must thoroughly clean the chamber with vinegar afterward. In 2026, many frequent travelers opt for "Heat and Moisture Exchangers" (HMEs), which are waterless humidifiers that use the moisture from your own breath, completely eliminating the need to carry or find distilled water while on the road or in the air.
When traveling with a CPAP machine in 2026, you should always strive to use distilled water to prevent mineral buildup and bacteria growth in the humidifier chamber. However, if distilled water is unavailable—common in remote hotels or during international travel—you can use bottled water (specifically "purified" or "reverse osmosis" water) as a temporary alternative. You should avoid tap water or "mineral water" whenever possible, as the calcium and magnesium will quickly leave a hard, white crust on the heating plate that can damage the machine over time. If you must use tap water in an emergency, it is a "pro-tip" to boil it first and let it cool, though this only kills bacteria and does not remove the minerals. For 2026 travelers, many now use waterless humidification systems (like the AirMini’s HumidX pods) which eliminate the need for water entirely, making airport security and "middle-of-the-night" refills a thing of the past.