Nicodemus is asking about water and spirit..eternal life.<quoted text>
Nicodemus was not ready yet to believe in Jesus.
"You are Israels teacher," said Jesus, "and do you not understand these things?
Ezekiel 36:25 I will sprinkle clean water on you, and you shall be clean from all your uncleannesses, and from all your idols I will cleanse you. 26 And I will give you a new heart, and a new spirit I will put within you. And I will remove the heart of stone from your flesh and give you a heart of flesh. 27 And I will put my Spirit within you, and cause you to walk in my statutes and be careful to obey my rules.
**The promise of the New Covenant to Israel.
"A new Heart...A new Spirit" - the born again experience Hank and has nothing to do with baptism.