Can I make kv straight from flour?

I love making and drinking my own kv. I was wondering if it was possible to make kv straight from rye flour or wheat flour, instead of making kv from bread. It seems if I am making it from bread I usually don't have enough bread or the bread is full of preservatives, additives, salt or it is just plain pricey. It seems it would be easier and cheaper to just make the kv from organic rye flour bought in bulk. How easy would it be to do this, has anyone tried it?