Water is a figure, it has nothing to do with the actual baptism.
At the point of salvation, every believer is baptized with the Holy Spirt into union with Christ.
Believers after they are saved, use water baptism as a public testimony of their identification with the death, burial and resurrection of Christ.
It has nothing to do with their salvation.
That is why John The Baptist stated what he did about Christ. Baptism was around before Christ. The Baptism of Christ was not. Another note is on The Lords Supper. Christ is present before any wine is poured or wafer passed out. Scripture states Where two or more gather in my name there I am also. The Lords Supper is a serious event done for our sakes for us too remember what Christ did for us at the cross as well as too examine our lives and heart. Examine, ask forgiveness, repent, then "Do in this in remembrance of me." It was a basic rite given believers. It isn't literal body and blood it is a remembrance of it.
The Lamb's bloods has done been spilled as an offering for sin, sprinkled in our spirit to cleanse us, and body offered and accepted by GOD. His Word given us is the new bread. Spiritually we live on it.