To drink from his cup is to know perfect love. To drink from his cup, is to be part of his family. To drink from his cup, is to accept that he controls your destiny. To drink from his cup, is to share his suffering in pain. To drink from his cup, is to stand in his word. To drink from his cup, is to be crucified with the lord.
The bread symbolizes his body which was broken for our sins. The cup is symbolic of his shed blood and the crucifixion which established the new covenant that reestablishes a divine relationship between God and man.