As has just been mentioned....
Acts 22:16
New International Version (NIV)
16 And now what are you waiting for? Get up, be baptized and wash your sins away, calling on his name.
So. While you call upon the name of the Lord - Do not neglect to be baptized and wash your sins away.
>>>>>>>>Acts 2:37 When the people heard this, they were cut to the heart and said to Peter and the other apostles, Brothers, what shall we do? <<<<<<<<<<
I think you know - clearly - what Peter told them to do. (v38) And if Christ commanded Peter to baptize and Peter commands repentence and baptism - then you know without a shadow of a doubt - that water baptism is no option.
Sure, but for some who call upon the Lord during the final moments of life and etc., it isn't possible. In every instance in scripture, acceptance/belief comes before baptism - not the other way around - No?