The word “and” ties together words or phrases granting them equal force. For example, your car must have gasoline “and” oil to operate. If you lose a black “and” white pet, you should include both colors in your description. Inserting “and” into a sentence will affect how that sentence is understood.
In regard to the Lord’s Supper, Paul wrote, “For as often as you eat this bread and drink this cup, you proclaim the Lord’s death till He comes” (1 Cor 11:26). To observe the Lord’s death requires both eating the unleavened bread “and” drinking the fruit of the vine. A Christian has not observed the Supper by only partaking of one element.