Article 10.2 - "In the event of a conflict between uses of water in an international watercourse, it shall be resolved [.] with special regard being given to the requirements of vital human needs."
The states negotiating the Convention included in the Statement of Understanding accompanying it an explicit definition that in determining 'vital human needs', special attention is to be paid to providing sufficient water to sustain human life. (P. Gleick, "The Human Right to Water").