It’s a bit sad to compare the 1962 prayer for the blessing (and exorcism) of water (and salt) with the current prayer:
Facing the font (or vessel) containing the water, the celebrant then blesses the water which will be used for baptism.
Father, you give us grace through sacramental signs, which tell us of the wonders of your unseen power. In baptism we use your gift of water, which you have made a rich symbol of the grace you give us in this sacrament. At the very dawn of creation your Spirit breathed on the waters, making them the wellspring of all holiness. The waters of the great flood you made a sign of the waters of baptism that make an end of sin and a new beginning of goodness. Through the waters of the Red Sea you led Israel out of slavery to be an image of God’s holy people, set free from sin by baptism. In the waters of the Jordan your Son was baptized by John and anointed with the Spirit. Your Son willed that water and blood should flow from his side as he hung upon the cross. After his resurrection he told his disciples: “Go out and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Spirit.” Father, look now with love upon your Church and unseal for it the fountain of baptism.
By the power of the Holy Spirit give to this water the grace of your Son, so that in the sacrament of baptism all those whom you have created in your likeness may be cleansed from sin and rise to a new birth of innocence by water and the Holy Spirit.
Before continuing, the celebrant pauses and touches the water with his right hand, or he may instead lower the Easter candle into the water once or three times, then hold it there for the remainder of the blessing.
We ask you, Father, with your Son to send the Holy Spirit upon the waters of this font. May all who are buried with Christ in the death of baptism rise also with him to newness of life.
We ask this through Christ our Lord. Amen.
(From the English translation of the Rite of Holy Week © 1972, ICEL. All Rights Reserved. The blessing is reprinted here for educational purposes only.)
That prayer is from the Rite of Holy Week, probably the Easter Vigil… I can check when I get home. There is probably a different blessing used at other times. For instance, the Asperges Rite at the beginning of Mass uses a different prayer.