I could be wrong but it seems logically to me that the way one could "get" some form of NTM from food/drink would be through reflux/GERD. So if one practices good gastro hygiene I would think one could reduce risk associated with getting NTM through food/drink. Good gastrointestinal hygiene might include avoiding GERD triggers (for me that's chocolate), eat small meals instead of large ones, stop all eating and drinking at least 3 hours before sleep, sleeping on an upright angle at night, to name a few.

That said I do scrub my potatoes, sweet and white, rinse the "triple washed" prepackaged salads in cold tap water, soak other veggies mainly to get the dirt off to lower the risk of food poisoning.

Regarding ice, my brain's telling me someone somewhere said/wrote that commercial bagged ice was ok but I am not sure where I read that. So far I've made my own with boiled water. I skip Starbucks sweet drinks as the added sugar, I've noticed, causes my lungs to feel gunkier than usual.