How to keep Berries Fresh.  The key to preventing moldy berries...
Berries are delicious, but they're also kind of delicate.  Raspberries in
particular seem like they can mold before you even get them home from
the market. 
There's nothing more tragic than paying $4+ for a pint of local
raspberries, blackberries, or peaches, (or strawberries!) only to
look in the fridge the next day and find that fuzzy mold growing
on their insides and outsides!
Well, with fresh berries just starting to hit farmers markets, we can
tell you how to keep them fresh!  Here's a tip I'm sharing on how to
prevent them from getting there in the first place:  Wash them with
vinegar!
When you get your berries home, prepare a mixture of one part vinegar (white
probably works best, but apple works too) and ten parts water.  Dump the
berries into the mixture and swirl around.  Drain, rinse if you want (though
the mixture is so diluted you can't taste the vinegar), put in a ziplock bag, and
pop in the fridge.  The vinegar kills any mold spores and other bacteria that
might be on the surface of the fruit, and voila!  Raspberries will last a week or
more, and strawberries go almost two weeks without getting moldy and soft.
 
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.
Happy berry eating!