I posted on this previously. You can buy a dog tag and have it engraved cheaply at shoe repairers, market stalls and the like. It could be attached to a keyring or a charm bracelet, or used as a pendant if your wanderer will accept it. It could be useful to write out a card and paste it into a glasses case. Maybe a laundry marker on various items of clothing would help. The ICE tag added to your phone contact would be understood by ambulance personnel. For the carer, a note at the front of your diary, if you carry one, should be enough to get help to your patient if you should be in an accident. However, for your home safety, don't put address details in; just contact details of somebody you can rely on to get help to your dependant.I made my own from plastic key fobs.