Where can i go find a false tooth to replace an adult tooth i lost?

This is really best: Handled by a dentist. Encourage you to consult with a dental professional.

You can't: Even if you can find a "tooth" how are you going to hold it in, elmer's glue? There's very good reason why you need 4 years of education to be licensed to practice dentistry. What you are proposing is at best foolish, at worst dangerous. Please call a pro, call your dentist.