This recipe is an advanced form of the no-knead bread which you will find all over the internet. If you are not fancy to mix different type of flours, then just go with regular all-purpose flour. You can substitute the cracked rye flour as well with all purpose flour, but it won't have the same effect. Cracked rye flour is not as fine as all-purpose flour, which makes that your bread crust will be crunchier.