Baptism of the Holy Spirit and Baptism of water is the same thing ([after Christ's death]--John's baptism of water did not include the Holy Spirit but it did include the remission of sins).
Some people seem to think that what happened in Acts 10, is something altogether special that continues to happen now-a-days and it's not. It was specifically told to us that
While Peter was still speaking these words, the Holy Spirit fell upon those who heard the word. And those of the circumcision who believed were astonished, as many as came with Peter, because the gift of the Holy Spirit has been poured out on the Gentiles also. For they heard them speak with tongues and magnify God. Then Peter answered, "can anyone forbid water, that these should NOT BE BAPTIZED who have received the Holy Spirit just as we have?" And he commanded them TO BE BAPTIZED in the name of the Lord. then they asked him to stay a few days.
--Acts 10:44-48
Even though the Holy Spirit was poured out on them, Peter still commanded them to be baptized. Why? Why were they to be baptized if the "water" part of baptism is not important?
If you look at that scene and see what it stood for, it was the first time that the Jews saw that even Gentiles would be part of the Kingdom. Peter's vision was a sign telling them that the Kingdom of God have opened up to the Gentiles:
"And as I began to speak, the Holy Spirit fell upon them, as upon us at the beginning. Then I remembered the word of the Lord how He said, 'John indeed baptized with water, but you shall be baptized with the Holy Spirit.' "If therefore God gave them the same gift as He gave us when we believed on the Lord Jesus Christ, who was I that I could withstand God?" When they heard these things they became silent; and they glorified God, saying, "Then God has also granted to the Gentiles repentance of life."
Acts 11:15-18
Some might be really tempted to say "see it specifically says "Baptism of the Holy Spirit" and therefore baptism of water is not necessary," but I ask you please don't think that. Because if that were the case, Peter would not have asked them to actually be baptized, after they have received the gift of the Holy Spirit.
As for Romans 8:1-2; 38-39, 1 Cor 12:13; 15:2 and John 5:11-12 (I'm not sure if John 1:11-12 is the correct verse you were trying to use) these verses does not necessary speak about the idea of baptism of the Holy Spirit...more of less it tells us about salvation. Especially in 1 Corinthians 15:2 when Paul tells us that the gospel of which he spoke saved us, baptism is part of the gospel of which he preached.