I've been grappling with this issue too. I feel some sense of responsibility here to walk the walk and talk the talk about clean eating even if I don't have it perfect yet.
I was thinking of giving snack bags of fat free pretzels or popcorn. However, I agree with the other posters that this should be a fun time. In my area, nobody makes homemade treats anymore as they are certain to get tossed in the trash. So, what to buy is the question.
I wish they made snack size granola bars or protein bars.