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a great read is the "Fourth Cup" by Dr Scott Hahn, which ties the Passover to the Last Supper, just as JEsus did when He stated " this is the NEW CONVENANT ". The Passover meal, starting with the Jews in Egypt, meant that everyone in thw whole family had to eat of the slaughtered lamb. Anyone who did not, was slain by the angel of death.

During His last Passover meal, Jesus stops at the 3rd cup, passes the bread and wine, makes His " This is my Body " discourse, and then we read that the apostles sang a hymn, and then went outside.. The ritual Passover had 4 cups of wine AND the Lamb is eaten by all. In the Last Supper, the only clear "lamb" that was eaten was Jesus Body and Blood, and the 4th Cup came at his death: " I will not drink of the fruit of the vine until...".

this is why He refused the wine/water offered to Him on the way to Calvary.