This is soooooo gross! If you have a reusable water bottle, you either need to WASH IT NOW or THROW IT AWAY (which is what I'm going to do hahah).
If you go more than a few days without washing it, your water bottle has more germs than a dog's food and water bowl!! And the same type of germs that attach to your toothbrush in the bathroom, if you get what I mean hahah.
WASH. YOUR. WATER. BOTTLE. Ewwwwwww.