Is there ANY scriptural evidence the apostles that did not depart ... actually practiced communion, or the eucharistic practice ... of bread to flesh, wine to blood ?
I would say your best Scriptural evidence would be in Corinthians:
1 Corinthians 10:16
Is not the cup of thanksgiving for which we give thanks a participation in the blood of Christ? And is not the bread that we break a participation in the body of Christ?
1 Corinthians 11:27
So then, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of sinning against the body and blood of the Lord.
1 Corinthians 11:29
For those who eat and drink without discerning the body of Christ eat and drink judgment on themselves.
Paul says the cup for which the are giving thanks is actually participation in the blood of the Lord; likewise the bread, a participation in His Body. Then he goes on to say that if they receive unworthily, they are sinning against His actual Body and Blood, and they should not fail to discern that this IS the body of Christ.