We don’t drink directly from streams or pools of water. Pre-technology humans would have had to use their hands to scoop water to their mouths and it’s more efficient when your mouth is closer to the water source since you don’t lose as much on the way up. We also just don’t spend much time bending over anymore which is probably another source of resistance that is missing.
Getting an illustrated children's Bible 22 years ago, I was most surprised by when God told the commander to tell his soldiers to drink from a stream and they were wildly idiosyncratic, some lapping like cats, some cupping the water into their hands etc.
Spoiler alert: commander did multiple tests, each selecting for idiosyncrasies, resulting in a force a fraction of the original size, and won the battle.
