Over the last week, distilled water used to humidify apnea patients’ CPAP machines has become almost impossible to find, reports Newsday.

Dr. Michael Weinstein, chief of sleep medicine at NYU Winthrop Hospital, said he wouldn’t recommend using tap water, although boiling it might help kill potential microorganisms, and urged users to contact manufacturers. “We haven’t really encountered this situation where people would have to use tap water on an ongoing basis … if you do use it, keep everything as clean as possible,” he said.

Get the full story at newsday.com