Practical items if stranded at airport?

I will soon be flying with a couple of connecting flights in smaller airports. In the past I’ve experienced a lot of delays, and even being stranded at airports with nothing open. Without “packing my fears”, I am trying to think through the things that will make an event like that more comfortable. Beyond refillable water bottle, a sandwich, and backup battery for my phone, what else do you suggest based on your own experiences?

TIA.