Well, God's word says to use water. And Christ specifically instructed his Apostles to baptize converts. Nothing there about some dream taking the place of the ceremony for anyone!
That's irrelevant since we're not discussing John's baptism and God's word draws a clear distinction between it and Christian baptism.
But he told questioners and his own disciples to do so! Why that is being fought against so vigorously by some here is a bit of a mystery, frankly.
Acts 11:9-17
The voice spoke from heaven a second time, ‘Do not call anything impure that God has made clean.’
This happened three times, and then it was all pulled up to heaven again.
Right then three men who had been sent to me from Caesarea stopped at the house where I was staying.
The Spirit told me to have no hesitation about going with them. These six brothers also went with me, and we entered the man’s house.
He told us how he had seen an angel appear in his house and say, ‘Send to Joppa for Simon who is called Peter.
He will bring you a message through which you and all your household will be saved.’
As I began to speak, the Holy Spirit came on them as he had come on us at the beginning.
Then I remembered what the Lord had said: ‘John baptized with water, but you will be baptized with the Holy Spirit.’
So if God gave them the same gift he gave us who believed in the Lord Jesus Christ, who was I to think that I could stand in God’s way?”
No water needed.
And you shouldn't try to stand in God's way.