system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 - Why does cold water "feel" so much better than warm/room temperature water when you're thirsty?

Even though I'm not necessarily hot, I'd much rather have a glass of cold water than a glass of room temperature water. Why is that?

Thank you!
gpt
Warm water is more likely to harbour microbes than cold water. Humans who have gottten infected by microbes are more likely to die. It logically follows that humans who prefer cold water would be less likely to die, and their genes, including the one specifying preference for cooler water, would most likely be carried on onto the next generation. Eventually, the gene got carried through the whole population, making preference for cooler water universal throughout the human race.

**tl;dr** Cold water is less likely to harbour potentially harmful microbes, and evolution just took it from there.