Wash fruit and sort for damaged fruit before freezing.
A general method for freezing fruit, which even works well for delicate berries like strawberries or raspberries: Arrange the fruit in a single layer on a baking tray. Once frozen, transfer to a plastic freezer bag or container. You can also prepare delicate berries with sugar or sugar syrup, then freeze.
For fruit that tends to brown - such as apples, peaches, nectarines and apricots - treat with ascorbic acid (vitamin C). Look for the powdered form in health food shops, chemists and some supermarkets (with the vitamins). To make an ascorbic acid wash: Dissolve 1/2 teaspoon of ascorbic acid powder (or finely crushed vitamin C tablets) in 3 tablespoons water. Sprinkle this mixture over the cut fruit.
Not sure you want to go through this trouble? An acceptable substitute is: Slice the fruit and dip the slices in about a litre of water plus a tablespoon of lemon juice, before drying and freezing.