Long term use of Dis.Water for humidifing in a CPAP breathing machine. CPAP is for sleep apnea problems?

After reading the information regarding the benifits and complications drinking distilled water over a long period of time, made me think about using it in the humidifier for my breathing machine. Is there enough exposure over a long period of time to be concerned about. If so, is there any other options to concider. Thanks