The purpose of this legislation is to establish conditions for the United States' engagement with Mexico, specifically regarding water delivery obligations under a treaty. The main objective is to ensure that Mexico fulfills its commitments to provide a certain amount of water to the U.S. from shared water sources, which is crucial for various uses, including agriculture and environmental needs. Key provisions of the legislation include a requirement for the Secretary of State to report to Congress on Mexico's water deliveries at least once a year.