Illinois' best selling grocery store item

I'm not trying to talk you into buying anything you wouldn't normally buy, but looking at the number-one best selling item in Illinois grocery stores, I'm going to go ahead and guess that you already buy this.

We've looked at some of the most expensive grocery items, the most stolen grocery items, and even the hardest to find grocery store items. Today, it's the best-selling grocery store item, and there's every chance you've got some at home (or just ran out, and are heading to the store for more).