Water tastes like saliva mixed with gravel. Ewww... And if you put it in a reusable plastic bottle, depending on what kind, it either tastes like saliva-mixed-with-gravel-mixed-with-rubber or gives you cancer.
Seriously, most of the time I don't mind the taste of water, but sometimes if I drink it by itself it literally makes me want to throw up. Still, I need it to live, so bottoms up!