Get out of there as soon as possible, OP. I feel bad for you.

"You're right. Thank you, mom, for the communal toothbrush and towel. Maybe we could earn a profit if we lease them out to other families as well."

Get new bathroom supplies and hide them in your room or something....I know it doesn't solve the verbal abuse but at least you know you'll have unused things until you can afford to move out.

Your mother is gross and your dad is an idiot. Good luck, OP.

Could be they're doing things like that to make you want to move out, but there's better ways to help you with that.

Sabotage time. Get some new secret supplies for yourself and dunk the toothbrush in the toilet.

This is when you go out buy a second toothbrush and washcloth of the same color (If you can, else buy 2 of the same and say it was time for new ones) Use the new one you leave in the bathroom on the toilet and find a way to leave a brown stain on the wash cloth. Then take the other set you actually use and make a spot for them in your bedroom were your parents wouldn't easily find them. On the plus side if the toothbrush is in your bedroom instead of the bathroom, it won't get covered in fecal matter when the toilet is flushed

I'd get extras and keep them in my room and stop using the ones in the bathroom

Join the military. branches like the navy can get you ahead in life. Just because it's the military doesn't mean you will be in combat. They have nurses, radiologists, hospitals, mechanics, and many other jobs that avoid combat deployments. You want to get out of your situation do that.. that's what I did and I don't regret it for a second

Couldn't you just keep your personal bathroom stuff in your room.