a neighbour near me used to never leave her house without taking her bus pass, other ID, and contact details for her sons.
she did this even if only going for a 15 min walk in the park across the road, even though she had her phone, and I was with her and I had my phone too.
at first I was puzzled why she needed a bus pass to walk in the park. she said it was in case we were both incapacitated.
anyway, people who are worried about such eventualities could just do old fashioned note or mini diary in wallet or handbag, with details, next of kin, GP, allergies, also in car.
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I suffer from 'What ifs' and this is my latest. What if DH and I were in an accident together who would inform our children and how would they find them as they live abroad? We have no other close relatives nearby. As you can see my mind can be quite lively especially in the early hours ...
I used to be on a church committee discussing funerals and what to do when someone died. One of the things we discussed was a personal request document to be filled in , while you were still compos mentis, with anything you would like such as to be buried or cremated, who to contact and so on and I suppose where to find your last will and testament. It was particularly meant for those living alone.
This document was to be left in the fridge!
I know it does sound strange but seemingly people look in the fridge and would find your list.
I can't say I've followed the advice. 
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