My daycare parents know what time my snack is and their child needs to be here to receive it. I am however flexible if they tell me IN ADVANCE they will be late in the am or early in the afternoon I can then make sure the child gets a snack. However none of them feels entitled to a snack if they are early or late and I would not continue to offer some sort of take home snack on a regular basis. Sometimes we have yogurt or fruit salad and I'm not sending my containers out and I'm not changing my meals either. I did send a child home with unfinished snack sometimes when a parent arrived early unexpectedly and if that was not possible then I would say I'm sorry he did not get to finish his snack he might be hungry when he gets home. It's never been an issue here.