Dangerous advice! water can carry Naegleria fowleri, known as the brain-eating amoeba
if its not completely sterile, it can cause sinus infections, and amoeba can cause infections in your brain, it can cause death, many people have died because of this sort of thing, and using neti pots with tap water up their nose
I got told to rince my nose out with water after snorting K, and was going to till I found out how dangerous it can be
So in the name of harm reduction, don't try this, unless it's that bacteriostatic sterile water I've heard people use for Injection, but this becomes less sterile if its been left opened once used, so smaller ampoules of it are better than buying larger amounts in bottles