If it is just about getting info to the parents I would probably do the email route. Send out one during naptime with the days meals and events and include anything you want to tell them as in it could be mass sent out to all or sent individually with a couple lines meant just for that family added to each. Pictures can be added as attachments. Still an issue though as once you send it they are free to forward to grandma or whomever.

Some also have a website with a secure area that is only for current clients.