An advance care directive is "used to document your care wishes so your substitute decision-maker can refer to it when making care decisions for you in the future, if and when you can't make those decisions for yourself." When properly signed and witnessed, a living will, will provide guidance for medical and health care decisions in the event the individual becomes incompetent and can no longer make such decisions.
It's fairly easy to get a copy of the advance care directive form for your state. Your local hospital is a reliable source, as federal law requires every hospital to not only provide information about advance directives to people in their service area, they are also required to share valuable information about the related laws in your state. Contact your local hospital to learn more. Your family physician may also have advance directive forms available for patients.
Dying with Dignity Canada also offers Advance Care Planning Kits to assist you in making your advance care directive.