The best way to keep a fruit salad crisp is to keep it stored in the refrigerator in a sealed container with a lid. Choose whole fruits like blueberries and grapes. Pineapple also lasts a long time in the refrigerator without getting soggy. Melons, like watermelon, cantaloupe, and honeydew, tend to get soggy quicker than other fruits. Bananas should only be cut right before serving summer salads with fruit.