Gee Sara, I apologize - I thought I answered you yesterday but my reply disappeared into the ether, I guess.

I buy my nebulizer parts from on-line home health suppliers, not loyal to any particular one, just whoever has the best price plus shipping and is in stock when I need it. I buy Pari neb cups, and each comes with replacement tubing. I am not aware of any parts on the Aerobika that need to be replaced.

The silicon "waffle mat" is a hot pad that happens to fit in the bottom of my sauce pan. It works great for this purpose, or for protecting a tabletop, but is lousy for picking up hot things because it is springy feeling.

When I boil things, I just used my filtered tap water - I can't see the need for distilled or spring water as the boiling kills any NTM in the water, along with on the parts. I can't say that about baby bottle or microwave sterilizers - don't use those
Sue