Contrary to popular belief, mentos and coke is not a chemical reaction. All you are gonna get is a ton of foam. This is created when the tiny bubbles from the coke nestle into the microscopic cavities (kind of like moon craters) on the mentos.
when the Mentos hits the surface of the coke, the compressed carbon dioxide forms bubble on the surface of the Mentos. and it is released into the air and pushes the coke out with it. the Mentos can be mint or fruit (I have tested both)