YOU SAID:
I had a cup of coffee today.
INTO JAPANESE
今日は一杯のコーヒーを飲みました。
BACK INTO ENGLISH
I drank a cup of coffee today.
INTO JAPANESE
今日は一杯のコーヒーを飲みました。
BACK INTO ENGLISH
I drank a cup of coffee today.
That didn't even make that much sense in English.