Keep going:
John 15:14 (NKJV) You are My friends if you do whatever I command you.
Jesus told the "disciples" to make "disciples", he told the "disciples" to baptize.
Paul tells us there is one saving baptism :
Ephesians 4:5 (NKJV) one Lord, one faith, one baptism;
John the baptizer tells us he (a disciple) baptizes with water, and that Jesus is the ONLY one who can baptize with the Holy Spirit and with Fire :
Matthew 3:11 (NKJV) I indeed baptize you with water unto repentance, but He who is coming after me is mightier than I, whose sandals I am not worthy to carry. He will baptize you with the Holy Spirit and fire.
Jesus tells the "disciples" to "Go therefore and make disciples of all the nations, baptizing them", he did not tell the disciples "Go therefore and I will make disciples of all the nations baptizing them", he told the disciples to do the baptizing,
Matthew 28:19-20 (NKJV) [SUP]19 [/SUP] Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, [SUP]20 [/SUP] teaching them to observe all things that I have commanded you; and lo, I am with you always, even to the end of the age." Amen.
the ONLY baptism a disciple can do is "water baptism" (Matt 3:11), and since there is only 1 saving baptism (Eph 4:5) then water baptism is required for salvation.