I kept meaning to share this, J&T's post reminded me.
My mom is the director of a DC in Jax and I was asking her about juice at DC. They are required to serve 2 aspects of a meal for snack; and juice counts as part of the meal. So if they serve crackers & juice, they are in compliance, but crackers & water would not be. That's why some of your DC might give you a hard time about not serving LO juice.