I have, for a very long time, kept a small bag packed in case of an emergency hospital stay. This includes a few days ostomy supplies, which are no always so available in hospital.
I feel that if I am not so prepared I am actually tempting fate.
Alexa on my mobile phone has a full list of my usual medications, Also, have this list in hardcopy in my diary.
When I went on eighteen months ago, for a small operation, I thought I had everything I needed with me, but found that I should also have taken some cereal bars. Went in early in the morning, not having been allowed to eat from 9 pm the previous night. Felt really peckish by the time I was back in the ward the evening of the op. and just received one very tiny baked potato, with no filling with it, for my main meal.
Even the following morning, as my bed was at the end of the ward round for servings, by the time they got me there was no cereal, and no toast left and I was given just a banana. I was really, really hungry.