Mine is the same. I do a cup of grated bar soap (pink zote is my fav), a cup of borax and a cup of washing soda. Then I just mix it all together. No water, nothing but stirring. I use 1 tablespoon per load.
So your method is for more of a "powder" or dry soap? Hmmmm.......the "liquid" version requires blending with a blender, which I don't currently have, so this method would certainly be easier at the moment.