Preheat oven to 350 degrees. Spread cherry pie mix into a 9x13" pan. Layer the pineapple over the top of the cherry mix. Sprinkle the cake mix over the top of the fruit. Pour water over the entire pan and sprinkle the nuts on top. Bake at 350 degrees for 45 minutes.
Mom notes that you can add whip cream or a scoop of ice cream on top for an extra jolt of yummy. Voila! A super easy, super fast-disappearing dessert treat! (Only one pan to clean up too - my kind of recipe Mom!!)
PS> I've made this with blueberry pie mix too, it's pretty tasty as well!