In the most general sense, a written statement of one's wishes, signed and possibly notarized, is sufficient to ensure that ones' medical instructions are carried out. If there are a lot of "ifs, ands and buts" to what you want to happen to you in the event of your incapacitation, you might need something more legalistic, but a DNR or "no extreme measures" or "no life support" order is an extremely simple thing to create.
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