ml/3½fl oz water

Water is a colorless, odorless liquid compound of hydrogen and oxygen (H₂O) that occurs naturally on Earth and constitutes approximately 70% of the planet's surface. In culinary contexts, water serves as the fundamental solvent and medium for cooking, hydration, and ingredient dissolution. The mineral content, pH, and temperature of water vary by source and region, influencing both the flavor and chemical interactions in food preparation. Culinary water is typically sourced from municipal supplies, wells, or commercial bottled sources, with variations in hardness (mineral content) and purity affecting cooking outcomes, particularly in baking, stock-making, and beverage preparation.

Water is indispensable across all culinary traditions as the primary cooking medium for boiling, steaming, poaching, and blanching; as a solvent for dissolving ingredients such as salt, sugar, and gelatin; and as a key component in doughs, batters, stocks, and sauces. It is essential for hydrating grains, legumes, and dried ingredients, and for adjusting the consistency of preparations. Water quality—particularly mineral content—affects baking chemistry, tea and coffee extraction, and the development of flavor in stocks and broths. In most recipes, water can be replaced by other liquids (broths, milk, wine) depending on desired flavor and cooking outcome.