Wills aren't accessed until well into the process of handling a person's death. It would still be a sort of chicken and egg scenario - does their will apply, as they're not technically deceased by this State's laws?

You can get medical bracelets for certain things, maybe something along those lines?

I believe that's what a living will is for. Should make sure you have one of those as well.

Not your will. You need a advance medical directive also known as a living will. Wills are for after death.