Baptism by Water: Immersion, Pouring, Sprinkling
All Christians believe that baptism by water is essential to
the administration of the sacrament.
John 3:5
Jesus answered (Nicodemus), "Amen, amen, I say to
you, no one can enter the kingdom of God without being
born of water and Spirit."
The Catholic Church believes that a "washing of the body
with natural water" is what is required for valid baptism.
 
Matthew 28:19
... baptizing them in the name of the Father, and of the
Son, and of the holy Spirit,