Yea, my kids can be pigs, but I am on their cases about throwing away the granola bar wrappers, etc. Generally, I do a visual search before they leave my room. I also let them have water bottles. here in New England, hardly any schools are air conditioned and it really gets hot since we don't end school until at least June 18th or so. I just couldn't eat in front of the kids and not let them eat!
Veronica, I taught fifth graders for 2 years and I found that they were much neater than my 7th graders. I just tell them my classroom is like my house and they need to act like they are at a dinner party at my house as far as the eating manners go!