I have a friend who, while traveling, used tap water for 3 days. He got a bad sinus infection (doc said it was caused by using the tap water) and it took him 3 months of antibiotics to clear it up. USE THE DISTILLED WATER!

I have purchased a Contec CMS50E Oximeter. I recorded all night (it was recording...I checked it a couple of times during the night). After 8 hours of recording I took it to my computer, brought up the SpO2 Review program, connected to the USB port via the supplied cable, turned on the CMS50E, turne...