But both “drink” and “minuman” here can mean the mass noun rather than a single drink in one bottle or glass. For example,
“Teenagers all like Cola. That’s their drink.”
“Remaja semua suka Cola. Itu minuman mereka.”
that is their drink must be accepted because 'itu' in itself does not distinguish a large volume from separate smaller volumes (a barrel of beer from glasses of beer, for instance)