Ultimate List of Healthy Travel Snacks

My five-year old, Gabby, and I are hitting the road in a couple days for our annual trip north to my hometown. As a self-admitted "muncher," I have always been one of those who packs the car or carry-on luggage with plenty of snacks. However, after we were both diagnosed with food allergies several years ago (wheat, dairy, eggs, soy, corn, and yeast, among others), stocking up before trips became an imperative. I know from experience that there are very long stretches of highway between here...