No doubt there are some fabulous recipes out there. I've only tried one and it was so-so; store bought works for me. Mediterranean brand hummus and Stacy's pita chips are my favorites, but I'm not a hummus snob because I don't eat it more than 3-4x/ month.
My concern for you is the possibility that a passenger might sue you if they claimed they got sick from the homemade hummus--whether or not it was the source. With a storebought product, you have recourse. As a passenger / total stranger, I'd be leery to try any food or drink that wasn't coming freshly opened from a manufacturer's labeled package, especially outdoors. When it comes to business, I think the small price for store bought hummus would be worth the peace of mind.