Only God can save and the idea that water can save is an insult to God. Because He is one in the same, and Jesus even told His apostles that they would be baptized in the Holy Spirit. This was right before He went to sit at the right hand of God. Acts 1 6. John s baptism was for repentance of sins, but it is the blood of Jesus that cleanses us thoroughly.
Communion is even easier.
When we partake of the communion wafer and drink, it is again showing our faith. Remember the true meaning of communion is a relationship, intimate relationship with God the Father. 2 Corinthians 13 14. The grace of the Lord Jesus Christ, and the love of God, and the communion of the Holy Ghost, be with you all. 2 Corinthians 13.