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Preheat the oven to 325ºF. Spray a stoneware bar pan or other large sheet pan (with at least 1" sides, about 14¾" x 10½") with cooking spray. Set aside.
In a large mixing bowl, whisk together the eggs, oil and water.
Add the 3 box brownie mixes and fold together with a rubber spatula, being careful not to over mix the brownies.
Spread the brownie batter evenly in the prepared pan.
Bake for 50 minutes or a toothpick inserted into the center of the brownies have no batter but a few moist crumbs.
Allow the brownies to cool before cutting.
Store in an airtight container at room temperature for up to 4 days. You can store any leftover brownies in the freezer for up to 6 weeks.