Haven't we all put a little plastic basket of berries in the fridge, gone to the fridge the next day and found fuzzy berries in the basket!!! Below is a recipe for preventing mold on fresh berries. (From the Internet) ... "so go forth and stock up on those pricey little gems, knowing they'll stay fresh as long as it takes you to eat them."
1 part white or apple cider vinegar
10 parts cold tap water
Pour the berries in the mixture and swirl around (gently). Drain, rinse if you want (although the mixture is so diluted you can’t taste the vinegar,) and pop in the fridge.
The vinegar kills any mold spores and other bacteria that might be on the surface, or in the stem end, of the berries. Raspberries, blackberries, boysenberries, etc. will last a week or more, and strawberries go almost two weeks without getting moldy or soft.