If you're just looking for something to munch on, here's a good dairy-free, nut-free, egg-free snack option that's relatively healthy, light on calories, and popular with both adults and kids. Fruity Booty is just one of the many natural snacks produced by Robert's American Gourmet. This one is puffed rice and corn with a mango and peach flavor. The flavor is actually quite subtle (I can't really distinguish that it's mango or peach), but regardless, it's still pretty good and I feel healthier eating this versus say a standard bag of potato chips. It's light and airy and would make a good replacement for popcorn.
(Robert's American Gourmet also makes Veggie Booty which is also dairy-free, nut-free, and egg-free, however, please note that the packaging for this product states that it was made in a facility that also produces dairy products.)