What is the purpose of a sprinkler system's water supply?

The primary purpose of a sprinkler system's water supply is to provide a reliable source of water for firefighting. This water is crucial during a fire incident as it enables the sprinkler system to activate and distribute water effectively over the area in need, helping to suppress or extinguish flames and prevent further damage. Ensuring an adequate and dependable water supply is vital for the efficacy of the sprinkler system in protecting lives and property.

While other options may mention water in various contexts, they do not reflect the essential role of the water supply in a fire protection system. Creating aesthetic water displays is unrelated to the practical firefighting function of sprinkler systems. Filling the system with water for testing is a procedural aspect that supports system maintenance but does not encapsulate the primary objective. Reducing water pressure during installation is not an intended purpose of the water supply; instead, it may be a consideration for system design but does not reflect the overall goal of providing effective fire protection.