You don't drink it
Are you sure you know what's in it? You decide not to drink it because you can not be sure.
Just as well, inside the bottle was some strong weedkiller to be used in the garden. Somebody had mixed it up and used the old bottle to store it in.
If you had drunk it your tummy and throat would have felt like it was on fire.
You decided to put it back and grab a drink from the fridge.
