I had issues with my nose for ages and got the tip to use a Rhino Horn from a friend. Using it daily helps a lot, but still one passage gets clogged up regularly. This is a cheap way to clear the passages, as all you need is water and kitchen salt. (later I discovered I have hay fever... ah well, this works better then any medication.
I mean you do you, but it has happened in places with safe drinking water. Apparently the amoeba can live in the distribution system? I dunno I'm not an expert just isn't a thing I would gamble on
I use a version of this, it's based on the neti pot from india. Completely natural technique and does more than clearing our your sinus. It also stops any post nasal drip, Globus (lump in the throat) and can help with snoring.