I am by no means an expert, but here are a couple of options that come to mind. I came up with most of these by thinking "what kind of emergency are you reasonably likely to run into at some point, and what can you do to mitigate them?"

• Learn some measure of first aid, or at least the Heimlich maneuver and CPR.

• Keep a Seat belt cutter and window breaker in your glove compartment. And on the subject, there are a bunch of other things that you may want to keep in your car as well.

• Have an emergency kit at home, and have a plan for dealing with natural disasters (fire, storms, etc). If you live with anyone, make sure that everyone is on the same page about this.

• On the financial side, have an emergency fund. This might not impress your friends, but given how likely financial emergencies (e.g. unexpectedly losing a job) are relative to other emergencies, this is a good thing to plan for nonetheless. I think the standard advice is to have something on the order 3-6 months of income tucked away for a rainy day.