diastatic and non diastitic

I just joined today after discovering a post on malted barley powder for bagels.

Well, I got a little lost in the threads.    I want to make a GOOD, old fashioned malted milk.  The crap that is available called malted milk mix just doesn't have a malted flavor to me.   I want to make my own from scratch.  Where do I buy non diastitic malted barley powder.  and what do I look for in the 'ingredients' on the label.  I don't like all the sugar in the pre made mixes like Carnation non the lack of real malt taste.