Both cold and room-temperature water are equally effective at hydrating the body. The temperature of the water does not have a significant impact on its ability to hydrate the body. Without a doubt, the most important thing is to drink enough water to maintain consistent hydration, regardless of temperature.Both cold and room-temperature water are equally effective at hydrating the body. The temperature of the water does not have a significant impact on its ability to hydrate the body. Without a doubt, the most important thing is to drink enough water to maintain consistent hydration, regardless of temperature.