Yield: about 4 3/4 cups
First prepare the fruit: stem and thoroughly crush fully ripe berries, one layer at a time. Measure into large bowl.
Then make the jam: Thoroughly mix sugar into prepared fruit; let stand 10 minutes. Mix water and fruit pectin in small saucepan. Bring to a full boil and boil 1 minute, stirring constantly; stir into fruit. Continue stirring 3 minutes. (A few sugar crystals will remain.) Ladle quickly into containers that have been rinsed in boiling water, filling to within 1/2 inch of tops. Cover at once with tight lids. Let stand at room temperature overnight, then store in freezer. Small amounts may be covered and stored in refrigerator up to 3 weeks.