Waterboarding yourself

1000% on only using distilled H2O.

Two more suggestions...one is heat it up in the microwave to closer to body temp, and second, because it is buffered saline (sodium chloride and sodium bicarbonate), it makes a perfect eyewash for when irritants get in one's eye.
 
So, stomach acid issues can contribute significantly to sinus issues. Something to be aware of.
Yard work can also be a very big contributer as can time in the woods. I wear a mask for some of the landscape work.
 
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