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Acts 8:36,38

As they traveled along the road they came to some water, and the eunuch said, "Look, there is water. What is to prevent my being baptized?" ... Then he ordered the chariot to stop, and Philip and the eunuch both went down into the water, and he baptized him.

Acts 10:47

"Can anyone withhold the water for baptizing these people, who have received the holy Spirit even as we have?"

The Apostolic Fathers attested to the practice of baptism by [physical] water in the early church.

The Didache (Syria, 70-110) (Ch 7): Regarding baptism, baptize thus. After giving the foregoing instructions, "Baptize in the name of the Father, and of the Son, and of the Holy Spirit" (Mt 28:19) in running water. But, if you have no running water, baptize in any other; and if you cannot in cold water, then in warm. But, if the one is lacking, pour the other three times on the head "in the name of the Father, and Son, and Holy Spirit."
Justin (Martyr) (Rome, 100-165), First Apology, Ch. 61: They (those to be baptized) then are brought by us where there is water, and are regenerated in the same manner in which we were ourselves regenerated. For, in the name of God, the Father and Lord of the universe, and of our Savior Jesus Christ, and of the Holy Spirit, they then receive the washing with water ... The reason for this we have received from the Apostles.