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Not a new one, but I've learned more recently:
Water does not last forever, is not all dinosaur pee. Natural processes create and destroy it, nonstop, since forever.
Got any plants nearby? Those fuckers are busily cracking water into glucose and oxygen so that you can breathe and eat. Have you said thank you once?!
6CO2 + 6H2O + light energy → C6H12O6 + 6O2
Take a shot of baking soda for your heartburn, oh boy will you create water!
NaHCO3 + 2HCl → NaCl + H2O + CO2
CAVEAT: The gas comes up your pipes, the water goes down your pipes. Violently. Probably a gravity thing. Not for the faint of heart, but hey, no heartburn!
That's what salt water does. That's how people die when they are in a life-raft and drink seawater: defecating terminally.
So I hear, thankfully only second-hand.