This document discusses various financial instruments that can be used to fund integrated water resource management (IWRM) projects and water systems. It outlines different options for charging users for water and water services. It also examines financing from national governments through grants, loans, and guarantees. External financing from development agencies and philanthropic organizations is also covered. The document discusses commercial loans, bonds, and private equity investments. It provides examples of how different countries employ various financing mechanisms like taxes and fees.