First Corinthians chapters 10 and 11 mentions one loaf of bread and one cup of wine.
1 Corinthians 10:17
And though we are many, we all eat from one loaf of bread, showing that we are one body.
1 Corinthians 11
23 For I pass on to you what I received from the Lord himself. On the night when he was betrayed, the Lord Jesus took some bread 24 and gave thanks to God for it. Then he broke it in pieces and said,“This is my body, which is given for you. Do this to remember me.” 25 In the same way, he took the cup of wine after supper, saying, “This cup is the new covenant between God and his people—an agreement confirmed with my blood. Do this to remember me as often as you drink it.” 26 For every time you eat this bread and drink this cup, you are announcing the Lord’s death until he comes again.
Many denominations use excuses to justify the goblets and biscuits (or separate pieces of bread). Some of them say it’s unhygienic. Well alcohol is antiseptic so it kills germs. Nobody can transfer a disease when drinking wine in the same cup. So it is perfectly healthy.
Also, many denominations condemn drinking wine because it is an alcoholic beverage. They fear that former alcohol abusers will go back to their addiction. For clarity’s sake, wine is not condemned in the New Covenant. Paul even encouraged Timothy to drink some wine for his stomach. All is good with moderation. We cannot decide whether to drink wine or grape juice based on our weakness towards alcohol. We need to follow the accurate text from the Scriptures. Besides, God is greater than our weakness.
Likewise, many believers in denominations who came out from the Catholic system took the Catholic ways with them. It should not matter what the Catholics do regarding this. What matters more is how we, believers, obey the instructions of the Lord, passed on by Paul, for the remembering of His death.
Moreover, many denominations confuse the Bread and the Cup to the Jewish supper of the Festival of the Unleavened Bread when the Passover Lamb is sacrificed. It is important to note that the supper and the breaking of bread are two different things. The Bread and the Cup (New Covenant) was instituted by the Lord after the Jewish supper (Old Covenant). Luke 22:20 reads, "After supper he took another cup of wine and said, “This cup is the new covenant between God and his people—an agreement confirmed with my blood, which is poured out as a sacrifice for you."
The assembly that I go to does the breaking of the bread every Sunday, the first day of the week. One needs to be more into the Scriptures to know that the early disciples gathered on the first day of the week to remember the Lord. So the breaking of the bread should be done every week, not every month or twice a month.
We can make as many excuses as we want to NOT follow the ONE loaf and ONE cup instruction in 1 Corinthians 10 and 11. But excuses from our part do not change in any way the Scriptures. And remember, we will all be receiving or losing rewards when we stand before the Lord Jesus Christ. So really, it is up to each one of us. We are accountable for our own actions.
2 Corinthians 5:10
For we must all stand before Christ to be judged. We will each receive whatever we deserve for the good or evil we have done in this earthly body.