Preheat oven to 375F. Place the berries in a greased 2 quart casserole dish. Sprinkle with cinnamon, water and lemon juice. Add sugar as desired. Berries can be tart and need the whole 4 tbsp. In a large bowl, combine oats, flour, brown sugar and butter. Mix with a pastry blender or fork till crumbly. Sprinkle the crumb mixture evenly over the fruit. Bake for 25-35 min or until fruit is tender and topping golden brown. Serve warm with ice cream.