'Supply' in the Bible

David had said, "On that day {when we attack the Jebusites}, one must attack the lame and the blind, [those] who hate the soul of David, by [means of] the water supply." For thus the blind and the lame would say, "He cannot come into the house."

David captured 1,000 of his chariots, 1,700 horsemen, and 20,000 foot soldiers. David hamstrung all the chariot horses except for enough to supply 100 chariots.

Then Joab sent messengers to David to say, “I have fought against Rabbah and have also captured the water supply.