Step 3: Baking and Jello
I got a 8x8 square baking pan and poured 80% of the batter into the pan. I used the remaining batter in some cupcake molds. I figured these were going to be my treats, but wound of using them on the cake later. I just followed the directions on the cake box for baking and prep.
After the cake cooled, I put it on a cooling rack, cleaned the pan and got ready to make the Jello. Since I was going to fit the Jello perfectly into the cake, I used the same cake pan for my Jello "Water". I read that if you want to make more solid Jello, you needed to use less water than normal. I used 3 boxes of blue Jello, and about half the water that was list on the Jello box. I realized that the depth of the Jello wasn't quite deep/tall enough to match the cake, and I only really needed about half the pan. So I placed a few bowls into the Jello to displace the liquid to the right height. Unlike the cake, Jello doesn't rise or fall. So when you get the right height, stick it in the fridge and check it in the morning.