Yes you can! You order any medical alert jewerly from Amazon and lots of order companies. Goggle medical alert jewerly.

Temu has some. CVS has some. They also have blank ones that can be customized. Or you can even get a dog tag (military). They can also be added to your health app in your phone. I’ve seen them for specific foods all around. I believe there are also waterproof tube like bracelets that you write on a paper and stick inside.

Best idea, besides those, clear phone case. Stick a business card written or make one online with a template and stick it under your case.

Many choices at Lauren's Hope Med ID. They look more like jewelry and you can get something to wear in water, if needed

Google Medicalert and buy it from them

Yes. I wore a Medic Alert bracelet for years. You can get it for any life threatening condition, I believe