During the recent SoCal fires, i had a discussion with my retired parents who live up in the hills above LA. I suggested that they keep a bug out kit near the door with essentials like water, snacks and warm clothes, their meds and their 'important documents'.

For this i suggested that they print out copies of things like their advance directives, names of their doctors, lawyer and a current list of the meds their taking, dosage and for what conditions.
In addition, i suggested that they have a digital backup on either a thumbdrive or cdrom that has the same info as well as other info in an encrypted file, such as scans of bank account statements, credit card statements, social security, drivers licenses, birth certificates, deeds, etc.
This stuff could just be scanned in and saved as a gif or pdf, something that you can read with the most basic computer (don't assume everyone has Microsoft, or even the right version) and be printed if necessary at a Kinko's for example.

The plan is that anything that is medical emergency related, is in plain view both in paper and digital, so that either they take it with them if something happens, or the paramedics can find it easily.

Stuff that is needed after a disaster is also available but encrypted to keep it out of the hands of identity thieves if the media should get lost or stolen. The unlock code should be given to trusted people like other family members just in case.

I suppose that it might be a good idea to keep a thumbdrive with this info on your person at all times, they fit on a keychain and with the plain and encrypted sections losing it isn't a huge deal.