There are a few factors but lets think about it from a biology side.
Imagine you’re out in the wild. You come across a shallow pool in the sun. Its warm. What is your brain telling you. This is old water, it has been sat stagnant in the sun for a long time. This water is not ideal.
Where is water going to be super cold? Running streams. What is your body telling you about that when its cold? Its fresh, its safe, drink more.
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