The language would almost certainly have been Hebrew, certainly we know that Psalms were sung and these would not have been in Aramaic, which was the vernacular (we think). Jesus would have used a Jewish kiddush cup, which was elaborate and made of precious metals. Depending on their financial resources, either silver or gold. I strongly suspect that bread and wine were not the only food present. The Last Supper would have been a ritual evening meal. Modern Jews traditionally start with soup. I could quite possibly have been a Passover meal, in which case there would have been eggs and bitter herbs and the other elements of the meal. So the bread would have been consumed as the staple. However we don’t know that for sure.
I think you are right about the ritual meal. Here are the elements in the gospel:
Matt 26:17-35
17 Now on the first day of Unleavened Bread the disciples came to Jesus, saying, “Where will you have us prepare for you to eat the passover?” 18 He said, “Go into the city to a certain one, and say to him, ‘The Teacher says, My time is at hand; I will keep the passover at your house with my disciples.’” 19 And the disciples did as Jesus had directed them, and they prepared the passover.
20 When it was evening, he sat at table with the twelve disciples; 21 and as they were eating,…
"He answered, "He who has dipped his hand in the dish with me, will betray me. …Judas, who betrayed him, said, “Is it I, Master?” He said to him, “You have said so.”
26 Now as they were eating, Jesus took bread, and blessed, and broke it, and gave it to the disciples and said, “Take, eat; this is my body.” 27 And he took a cup, and when he had given thanks he gave it to them, saying, “Drink of it, all of you; 28 for this is my blood of the covenant, which is poured out for many for the forgiveness of sins. 29 I tell you I shall not drink again of this fruit of the vine until that day when I drink it new with you in my Father’s kingdom.”
30 And when they had sung a hymn, they went out to the Mount of Olives. "
In Luke’s account:
Luke 22:7-23
7 Then came the day of Unleavened Bread, on which the passover lamb had to be sacrificed.
14 And when the hour came, he sat at table, and the apostles with him. 15 And he said to them, “I** have earnestly desired to eat this passover with you before I suffer**; 16 for I tell you I shall not eat it until it is fulfilled in the kingdom of God.” 17 And he took a cup, and when he had given thanks he said, “Take this, and
divide it among yourselves; 18 for I tell you that from now on I shall not drink of the fruit of the vine until the kingdom of God comes.” 19 And he took bread, and when he had given thanks he broke it and gave it to them, saying, “This is my body which is given for you. Do this in remembrance of me.” 20 And likewise the cup after supper, saying, “This cup which is poured out for you is the new covenant in my blood.”
Interesting here he gives them the bread and says “divide it among yourselves”. That would be hard to do if it was already on the tongue!
John 13:2-4
2 And during supper, when the devil had already put it into the heart of Judas Iscariot, Simon’s son, to betray him, 3 Jesus, knowing that the Father had given all things into his hands, and that he had come from God and was going to God, 4 rose from supper, laid aside his garments, and girded himself with a towel.
John is the only one that includes to washing of the feet. Did Jesus get up from the meal? Or, since it was a ritual meal, after they had eaten, did he wash the feet?