Haven’t we discussed this... maybe not.

Off the top of my head:
1. appropriate outerwear for the conditions,
2. Shoes which are good for walking distance and protecting your feet (not beach flops/shower shoes)
3. an umbrella
4. Cash - Minimum would be enough for a few meals and a taxi/Uber ride home — in my case >$100.
5. In the great desert Southwest, a car/truck with a multi-day survival kit in the trunk. (Back east I’d have gone with my bicycle but the commute here is 10x what it was there.)
6. A sharp instrument for cutting, quality knife/serious scissors (non-locking folder in NYC and other urban areas). Urban - think SAK or LM. I EDC an SAK, a locking folder and folding scissors - different tools for different needs.
7. Flashlight, AA or AAA, LED,various outputs for different situations. I EDC a 1xAAA.
8. Cellphone (smartphone or otherwise). I’m transitioning back to a basic flip-phone, it’s all I need and I can have a spare battery. People these days are so proud they can buy coffee with their smartphone

I’ll reserve 9 & 10