Preheat your oven to 350°F (175°C).
Prepare a 9x13 inch baking pan with cooking spray.
In a large bowl, mix the cake mix, eggs, and water until smooth.
Pour the batter into the prepared baking pan.
Bake for 30 minutes or until a toothpick inserted comes out clean.
Remove from the oven and let cool for 10 minutes.
Poke holes in the cake using a fork.
In a separate bowl, dissolve the jello in boiling water.
Add cold water to the jello mixture and stir well.
Pour the jello mixture evenly over the cake, allowing it to seep into the holes.
Refrigerate the cake for at least 4 hours or overnight.
Top with whipped topping and fresh fruit before serving.