The priest took the water in the Scripture as the physical water that he knew of by instinct, and he failed to see God's divine nature that was contained in the word.
"For since the creation of the world His invisible attributes, His eternal power and divine nature, have been clearly seen, being understood through what has been made, so that they are without excuse." (Romans 1:20)
In John 6:63, "It is the Spirit who gives life; the flesh profits nothing; the words that I have spoken to you are spirit and are life."
When we want the answer to 'water,' we should look to the Word of God for the answer.
In 1 John 5:6, "This is the One who came by water and blood, Jesus Christ; not with the water only, but with the water and with the blood It is the Spirit who testifies, because the Spirit is the truth."
There is also John 4:10, Jesus answered and said to her, "If you knew the gift of God, and who it is who says to you, 'Give Me a drink,' you would have asked Him, and He would have given you living water."
Surely one would not think that Jesus had some secret location of a fountain of physical water that you would think of; that's the flesh. The water means the message about Jesus, and we should be drinking that water, meaning, we should be receiving the message about Jesus Christ into our hearts.
The physical water cannot make you a better Christian; it's just water. Your free will has to accept the gospel that is proclaimed; you can't accept the gospel of your own free will if only some water is sprinkled at you.