The person with custody is obliged to follow YOUR instructions regarding medical care and the withholding thereof. Specifying the type of medical care you want (or not) is the key.
But do know that the term of art, "extraordinary medical means" includes food and water, and is not limited to resprirators; artifical lungs; articifial kidney; and so on. Even an IV drip is a medical procedure.
I am against anyone classifying food and water no matter how it is ingested as life support, artificial means, extraordinary measures.
I knew it was a matter of time before DNR orders meant DON'T FEED.
Sick sick sick