Preheat the oven to 325F. Grease a 9x13 casserole dish with baking spray. Line with two layers of parchment paper across the short end of the dish leaving overhang on either side. Clip the edges down with binder clips on either side and spray again with the baking spray. In a medium bowl, mix the brownie packages, eggs, flavorless oil and water together until well combined. Pour into the prepared 9x13 pan and bake for 30-35 minutes, or until the center has set. Let cool to room temperature.