Passover Seder In Upper Room
The wine of the Passover is mysterious in origin, as it was not commanded in the instructions for the Passover, but developed over time. https://jewsforjesus.org/newsletter-mar-2002/the-mystery-of-the-passover-cup
However, the symbolic use of cup as a representation of judgement is well established in scripture. Jesus prayed in the garden "Let this cup pass from me." http://www.desiringgod.org/articles/the-cup-consumed-for-us
Therefore we have no reason to focus on the container, but rather on the death, burial, and resurrection of Jesus. We have life by being members of His body. We eat and drink the bread and the wine in memory of His sacrificial offering for our sins.
Jesus and His disciples ate the Passover in an upper room in the Essene quarter of Mt. Zion on Wednesday night. He washed the disciples feet, and said we should do likewise. They sat on the floor around a table. They drank real wine. Jesus said that as often as we eat this supper, we should do so in remembrance of Him.
We should avoid setting rules about our personal understandings of what scripture teaches. The several accounts of what happened should be laid down beside each other, examined in the light of all scripture, and applied in accordance with what Paul taught in Romans 14. We are not in the business of binding laws based upon opinion, but we are in the work of building each other up in love.
"By this shall all men know you are my disciples, by the love you have for each other."