Preheat oven to 350 degrees.
Start by mixing the crumble topping together in a bowl. Add the melted butter, brown sugar, flour, oats, cinnamon and salt to a bowl and mix with a fork until everything is well incorporated. Place in the fridge.
Butter a 9x13 pan.
To a bowl mix 4 cans of drained peaches with 1 can of peaches in heavy syrup. Include the syrup from the can to the bowl.
Add sugar, flour, cinnamon and water to the peaches and mix until combined.
Add peaches to the 9x13 pan and evenly top with the crumble mixture.
Bake for an hour uncovered.
Let rest for 20+ minutes so the gooey center sets.
Serve warm with ice cream or whipped cream.