When the people of Israel saw the manna, they said to one another, “What is it?” For they did not know what it was. And Moses said to them, “It is the bread that YHWH has given you to eat.”
Exodus 16:15

Water is symbolic of God's Spirit. The manna in the wilderness, bread from Heaven, was given by dew, and #yeshua, the Bread of Life sent from Heaven, was given by the Holy Spirit. Israel didn't recognize the manna when God sent it to save them, and neither did they recognize Yeshua when they saw him.