Please tell me if there is anything you can do to get 20/20 vision without laser surgery?

Depends on goal: If you want a non-surgical way to achieve perfect vision then your only option is contacts or glasses, there are no exercises, natural, organic, or supplement means to achieve this. If you are a low myope you can try orthokeratology which involves using contact lens pressure to remold the eye which can help but requires a 'keeper' at night.