Preheat oven to 350 degrees.
Start by mixing the crumble topping together in a bowl. Add the cold butter, brown sugar, flour, oats, cinnamon and salt to a bowl and either use a pastry cutter or your fingers to break up the butter and create crumbs by squeezing everything together over and over again. 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. Broil with the door open at the end for extra color on top if needed.
Serve warm with ice cream.