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The document entitled a "living will" is not currently recommended. Living will have become challenged or ignored in too many cases lately.
Instead, the document entitled "Advanced Directies" should be executed and witnessed.
http://www.uslivingwillregistry.com/forms.shtm
You should also execute a "Durable Power of Attorney" so that someone you trust can take charge to ensure your wishes are followed.
You can have your attorney draw up these documents---or if you don't want to give more specific special instructions, you can use the free form for your state at the link above.
Dys, Diane and I recently updated our documents for New Mexico law. If you've moved from the state in which you executed your documents, you should update them for your current state residence.
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