After nebulizing And aerobika but before you take a walk, do you have breakfast? What kind of airway clearing do you do to cough the mucus after the walk?

I was told to do airway clearance first thing in the morning and before bed. I don't produce much mucus when doing my acapella and felt like I was trying too hard and was going to hurt my lungs with a hard huff cough. I have been doing it like that for over 2 years and was told it’s okay. Now they want me to try nebulizing with albuterol, then saline and then Aerobika. All of the sudden it seems like a lot. I’ve been looking at posts here and watching videos to know how to do all this new stuff.
In reading the Aerobika it instructs to breathe in thru the devise and out, I never breathed into Acappela, just out… Do others breathe in and out Aerobika or just out? Also, I was wondering if I can rinse my neb and aerobika parts in distilled water or is it better to use boiled rinse water. I was never too concerned because I never breathed in on anything before.