I'm not sure about just water but those of you who prefer not to use eggs and oil in their brownie mix can add soda (any flavor) to the mix and bake as directed. Substitute soda for the total amount of liquid called for, figuring 1/4 cup for each egg and equal amounts for the oil and water. The brownies will turn out more cake-like and crumbly. NOTE: I haven't tested this method and I wouldn't try it for brownie bites, because they would be too crumbly.