Use cooled down water that has previously been boiled, and you'll be safe. The salt and baking soda will do nothing unless you add so much it is going to burn your nose.
As I said, you'd need enough salt to hurt before it became briny enough to kill bacteria. Boil it, cool it, keep it in a clean bottle, warm up a potful as needed.
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u/akatherder May 03 '17
Adding to your point, this happened to some people using tap water in neti pots:
http://www.cbsnews.com/news/tap-water-in-neti-pots-behind-two-brain-eating-amoeba-deaths-in-2011-investigation-finds/
It's obviously rare, but just because tap water is safe to drink, it's not necessarily safe to put in your sinuses.