I'm a certified LEO OC Instructor, and normally run 3-4 cert classes a year. Last time I checked, I have over 50 sprays on the street or back in Corrections. Suffice to say I have a little experience with the stuff.
I think it's the greatest thing since sliced bread. Our department as a group uses OC a lot. We even place it in front of Empty Hand Techniques on our Force Continuum.
You've been given some good advice. In my experience, fresh air & cool water help recovery the best. I've tried all the aftermarket antidotes I've come across, and can't say I've found one that works better. No matter what you do, it will take you 45 minutes up to 2 hours before you'll be able to function.
I highly recommend you take the cert class before carrying the stuff. Remember it's a Use Of Force, and you will be held liable for it's use. You want to find yourself in a liability box fast, use a method of force without being able to document you've been trained in it's use.
I would recommend against being sprayed unless it's done in a classroom setting under the supervision of a certified instructor. You could experience anything from a medical or allergic reaction to a full blown panic attack (I usually see at least one panic attack in every class, some are real doozies). If he has any experience at all, your instructor has seen it and will be able to help you safely deal with it, and has the knowledge to help you through recovery...