How does Billy provide food and water for the wolf on the trip?

Billy crosses over into the Mexican State of Sonora with the wolf. He is cold that first night though warmer because of a blanket given to him by Jean Ellen. Billy seizes an opportunity to shoot a rabbit and chops up the liver and heart for the wolf, though she initially refuses it. Billy pushes her down on her side and trickles water into her mouth periodically and she comes to accept this as the way to have a drink. She eventually accepts the rabbit as well. When he manages to shoot a turkey, he and the wolf eat the entire bird.