I always felt and was told that drinking water AFTER will only make things worse.
My suggestion is:
take a nasy BC or Goody's powdered medicine BEFORE you drink. That is the best remedy yet.
Now the P....., it does well when one has a cold or the sinuses are bothering you. After that, I didn't have one sniff or drip or cough. LOL
Someone told me, that drinking beers the next morning helps, too. I don't know about that.