What Lord Jesus gave them to drink is the blood of the new covenant, which is the fruit of the vine.
Matthew 26:27-29 (WEB) 27 He took the cup, gave thanks, and gave to them, saying, “All of you drink it, 28 for this is my blood of the new covenant, which is poured out for many for the remission of sins. 29 But I tell you that I will not drink of THIS fruit of the vine
Therefore, the fruit of the vine represents the blood of the covenant. That is Lord Jesus own explanation.
What you're doing is taking
one sentence and finding something that isn't there. What begins at the Passover meal is finished at the cross. Wine that you get at the liquor store is not the blood of Jesus. Jesus tells us that "This is My Body" and "This is My Blood." We are to "Do this" which means the breaking and blessing of the bread, the words of consecration, and distribution to the people. Sadly the meaning has been even more obscured since the three leaders of he reformation came up with their own ideas of what the Eucharist is. The words of Jesus are true:
John 6:53-56 Amen, amen, I say to you, unless you eat the flesh of the Son of Man and drink his blood, you do not have life within you. Whoever eats my flesh and drinks my blood has eternal life. For my flesh is true food, and my blood is true drink. Whoever eats my flesh and drinks my blood remains in me and I in him.
Jon 19:29 “A bowl of sour wine stood there; so they put a sponge full of the vinegar on
hyssop and held it to his mouth”
Exodus 12:21-23 Then Moses called all the elders of Israel, and said to them, “Select lambs for yourselves according to your families, and kill the passover lamb. 22 Take a bunch of
hyssop and dip it in the blood which is in the basin, and touch the lintel and the two doorposts with the blood which is in the basin; and none of you shall go out of the door of his house until the morning. 23 For the Lord will pass through to slay the Egyptians; and when he sees the blood on the lintel and on the two doorposts, the Lord will pass over the door, and will not allow the destroyer to enter your houses to slay you. RSVCE
The cup of blessing, the third cup of the Passover meal, is indeed referred to in the Bible, as per below. The hyssop and the four cups are part of the sacrificial ritual. But if you don't care for that explanation you can just leave it at say you don't know what Jesus was referring to. But picking out one sentence to discredit all that Jesus has emphasized, "Truly, truly" he says, is great folly.
1 Cor 10:16
The cup of blessing that we bless, is it not a participation in the blood of Christ? The bread that we break, is it not a participation in the body of Christ?