"Thou shalt sprinkle me with hyssop, and I shall be cleansed: thou shalt wash me, and I shall be made whiter than snow." Psalm 50:9
"And he said: Bring me a new vessel, and put salt into it. And when they had brought it, He went out to the spring of the waters, and cast the salt into it, and said: Thus saith the Lord: I have healed these waters, and there shall be no more in them death or barrenness. And the waters were healed unto this day, according to the word of Eliseus, which he spoke." 4 Kings 2:20-22
That is OLD TESTAMENT and as all of us know the old testament ceremonies and sacrifices were to point us to Christ..we are under a NEW covenant (testament) now as I am sure you know..Christ fulfilled the types..they are finished..so please show me where the apostles taught the water was demon filled and needed to be exorcised