One of the key parts is making sure that the information is communicated. This can be hard, but you can put notices in various key places to let doctors, police, and emergency folks know where to look. This should be public information and first hour[1], so you don't want to put passwords. Also give the contact information to your trusted people[2].
Mostly, this is information that a stranger would have a chance of looking and know where to start.
Below are various useful links within this site and to related sites (not all have been converted over to Gemini).