Preheat oven to 375 degrees. Grease the bottom of a 9x13 inch pan. Combine dry cake mix and oats in a large bowl. Add melted butter and stir until crumbly. Measure half of crumb mixture (about 3 cups) into pan. Press firmly to cover the bottom.
Combine preserves and water: stir until blended. Spread over crumb mixture in pan. Sprinkle remaining crumb mixture over preserves. Pat firmly to make the top even. Bake at 375 degrees for 18-23 minutes, or until top is very light brown. Cool in pan on rack: cut into bars. Store in an airtight container.