The bitter-tasting water had left some kind of film behind that made his mouth taste as if he'd been chewing on rusty nails.

However thematically correct, they make everything else in your mouth taste gritty.

My mouth tastes like it's had a bird in it.

"So that's why my mouth tastes like rotting leaves."

Naturally I understand that the eyes see, the nose smells, the mouth tastes and the ears hear?

My mouth tastes about as bad as it can get.

"His mouth tastes like the midden, and he terrifies me!"

And my mouth tastes foul so I'm not very hungry.

My mouth tastes like something died in it.

"My mouth tastes like an unemptied ashtray and I'm dry as paper."