My todddlers love to eat grapes.  In the summer, I buy them on sale and then freeze them.  That way, I save money getting more for the sale price and they can eat a cold snack on those HHH days.  For best results: wash them first, then lay them out on a cookie sheet and put them in the freezer.  This way, they don't stick together.  Once they are frozen, you can put them in a Ziploc bag until you are ready to serve them.