Final answer:
The chemical reaction type that always results in the production of water as a product is dehydration synthesis, also known as a condensation reaction.
Step-by-step explanation:
The type of chemical reaction that always involves water as one of the products is known as dehydration synthesis or a condensation reaction. During dehydration synthesis, one reactant provides a hydrogen atom, and another reactant contributes a hydroxyl group (OH), which combine to form a molecule of water as they create a new covalent bond. This process is typically seen in the formation of complex molecules like those found in living organisms, where smaller molecules join to form larger ones with the release of water.