Airway clearance is one of the cornerstones of "watchful waiting." The efforts help expel the sticky mucus where MAC grows and keep your lungs healthy. There is evidence that 7% saline also helps reduce the number of bacteria able to grow. In my humble opinion, waiting without doing airway clearance is just waiting for the infection to get worse.
Can you consult with the doc (and possibly a respiratory therapist) about airway clearance?
Otherwise, come on back to Connect and do some reading in our support group.
Sue