1)     If at such a time the situation should arise in which there is no reasonable expectation of my recovery from extreme physical or mental disability, I direct that I be allowed to die and not be kept alive by medications, artificial means or “heroic measures”. I do, however ask that medication be mercifully administered to me to alleviate suffering even though this may shorten my remaining life.

(This option or ones similar to it are often used to instruct an attorney. However, you should be aware that some of the terms, i.e.,  "extreme disability" "heroic measures", etc. are open to debate as to their precise meaning. Your attorney may be blocked from exercising full authority if the meaning of any of the terms you use is challenged.) 

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2)     In exercise of the authority granted herein, my attorney shall bear in mind my wish and instruction that all reasonable means be taken at all times to preserve and extend my life, including without limitation resort to the best available medical care and attention. Further, I direct that sufficient nourishment be provided to me at all times so as to prevent death by starvation or dehydration.

(This option expresses a different approach to medical and end-of-life decisions. It suffers the same problem as the first in that some of the terms are open to different interpretations.)

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3) There are no restrictions or conditions of any kind whatsoever affecting the exercise of this power of attorney. My attorney(s) knows my wishes with respect to personal care and I give my attorney absolute authority in the matter.

(This is the best option when one is certain that the attorney knows your wishes. It removes all room for debate over the interpretation of terms and leaves your attorney with full authority. It does, however, make the very important assumption that your attorney is in fact aware of precisely what you want.)

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4) There are no restrictions or conditions of any kind whatsoever affecting the exercise of this power of attorney. My attorney(s) knows my wishes with respect to personal care and I give my attorney absolute authority in the matter. Without limiting the generality of the foregoing, or detracting in any way from the authority of my attorney in such matters, I hereby state my wish that should I be in such a state of disability as to be unable to nourish myself, I expect to be provided with such of amount of water and food so as to avoid an inhumane death caused by dehydration and/or starvation.

(This is a variant on option number 3 above.)