Others will need to respond regarding MAC/pseudomonas and coffee habits. As for me, I have had bronchiectasis for some time. No MAC/pseudomonas so far and trying to keep it that way. For coffee I use Nespresso but would not hesitate drinking coffee from Keurig. In both cases I use cold tap water. My feeling is as long I do not recline after drinking my once a day cup of java there is no harm no foul. Of course, regularly descale the coffee maker according to manufacturer instructions. Ultimately, you need to decide for yourself after gathering information. It's really tough when one place adamantly declares a certain stance. It can read like fear mongering rather than safety. So far I have not seen any literature backing up the fear mongering. Please correct me if I am wrong!