Sorry to disappoint you briang72 but that link just shows me how other doctrines crept into the Church with the passing of years.I shall comment only on the Didache, which the article gives as 70 AD for its composition. On this dating the following applies:
“Some commentators argue for a date of effective origin as early as around 70 or soon thereafter,[4] and others as late as the later 2nd century[5] or even the 3rd century.[6] There is simply no way to fix an absolute date to anything more specific than the broad range between 70 and the third century. All the best arguments have not been determinative. Those in favor of an earlier date have tended to push for their own point of view, and those contrary to theirs” Wikipaedia.
Now let’s turn to the subject of Baptism. This is what the Didache says: "Chapter 7. Concerning Baptism. And concerning baptism, baptize this way: Having first said all these things, baptize into the name of the Father, and of the Son, and of the Holy Spirit, in living water. But if you have no living water, baptize into other water; and if you cannot do so in cold water, do so in warm. But if you have neither, pour out water three times upon the head into the name of Father and Son and Holy Spirit. But before the baptism let the baptizer fast, and the baptized, and whoever else can; but you shall order the baptized to fast one or two days before." Notice the introduction of extra-Biblical requirements?
From the simplicity of the baptism of the Ethiopian
(Act 8:35-38) “Then Philip opened his mouth, and began at the same scripture, and preached unto him Jesus.
And as they went on their way, they came unto a certain water: and the eunuch said, See, here is water; what doth hinder me to be baptized?
And Philip said, If thou believest with all thine heart, thou mayest. And he answered and said, I believe that Jesus Christ is the Son of God.
And he commanded the chariot to stand still: and they went down both into the water, both Philip and the eunuch; and he baptized him.” where all it required was faith/belief.
From “repent and be baptised” it became “repent- fast for 2 days- and be baptised”.