When you arrive home from the grocery mix together 1 part distilled white or cider vinegar to 10 parts clean fresh water and swish about in a large bowl or basin. Empty your fresh berries into the solution and gently agitate them about. Drain well and store in the refrigerator as you normally would.
The berries do not pick up the vinegar flavor but just the little bit of vinegar will KILL the MOLD SPORES!! Happy days. Betty said the berries should keep a week without mold which is a marked improvement as I have seen them mold in a day before.
So enjoy your fresh berries longer this year, you can bet I will.