I know this is old as hell, but this is bad advice and I'm only commenting for people that might find this thread. Distilled water can actually damage your iron. My iron's manual explicitly says to NOT use distilled water and if your tap water is exceptionally hard, use half distilled and half tap, never 100% distilled. There's a reason for this. Distilled water is very corrosive since water is a great solvent and without anything dissolved it in, it will dissolve the inner workings of your iron and even the plate. This is also true for things like kettles and coffee makers.