My first thought when I saw the picture was "Chef Steps just had a video on bagels" . They look awesome!! Where'd you get the "Diastatic malt powder" and "Malt syrup"?
I had the diastatic malt powder from when I made baguettes, but I bought it on Amazon. You can get malt syrup from Whole Foods, although I didn't have any. A sub for malt syrup is molasses or honey, but 1) you'll miss the malt flavor and 2) honey will make the bagels taste more like Montreal style bagel, as they boil their bagels in honey-sweetened water.