Lemon-Berry Firecracker Cake

Name: Lemon-Berry Firecracker Cake
Prep time: 15 min
Total time: 15 min
Cuisine: American
Ingredients: Cooking spray; 1 (15.25-oz.) box white cake mix; 1 (3.4-oz.) package instant lemon pudding mix; 4 large eggs; 1/2 c. vegetable oil; 1 c. plus 1 tbsp. (or more) lukewarm water; 1/4 c. raspberry jam; 7 (or more) drops red gel food coloring, divided; 1/4 c. blueberry jam; 7 (or more) drops blue gel food coloring, divided; 3 c. powdered sugar; 2 tbsp. fresh lemon juice; 1/4 c. red, white, and blue sprinkles