Cold water was probably less refreshing for early humans due to most cold water likely only being available during colder weather.

Cold water is easy to heat if you know how to make fire. Most early humans probably knew how to make fire. Hot water, however, is difficult to cool without refrigeration.

Spring and well water is often cool. I don’t know about the water that comes down from the mountains. Does it retain it’s coolness when the snow melts and runs down into the valley?