Charles Ellicott Commentary Ruth 2:9

"Let thine eyes be on the field that they do reap, and go thou after them: have I not charged the young men that they shall not touch thee? and when thou art athirst, go unto the vessels, and drink of that which the young men have drawn." — Ruth 2:9 (ASV)

Have drawn. —Literally, shall (from time to time) draw. Possibly from that very same well at Bethlehem from which David desired to drink (2 Samuel 23:15).