Water.
Everything else listed has high fructose corn syrup, and limits the sensation of fullness, leading to liver disease, obesity, and diabetes. And genetically modified ingredients are required to make it.
And Mountain Dew in particular causes 2 to 5 times the tooth decay of other sodas, causing MOUNTAIN DEW MOUTH, which is probably the scariest thing you could do to your teeth other than meth or slamming bricks into your mouth.