When I did a lot of flying we carried "bingo" bags which was a bag that carried required "stuff" if you found yourself needing to land somewhere unplanned. I presume the term originated from bingo fuel, meaning that you needed to find a place to land NOW.

I always carried cash and a checkbook (this was before I discovered credit cards), a change of clothes (polo shirt, shorts and tennis shoes) and don't recall carrying much else. If I needed it I'd buy it. This wasn't an "I expect to land somewhere else" bag and didn't carry any survival items. Survival gear was part of normal flight gear and unnecessary in a bingo bag.