Glad your young ones are enjoying themselves.

When I see bottles with something in them, I usually open them and let their contents be accessible to critters. In this case , peanut butter is attractive to many creatures besides humans. In our neck of the woods I most frequently see a bottle of water. So, I open it and pour the water under a tree.

A racoon or squirrel ( or bear) will lick the peanut butter and polish that jar sparkling clean !
Something to think about for the next trip.