At home Batch Testing a Powdered formula - water activity under .6aw

We are a small at-home manufacturer of dry shampoo tablets and have just received our water activity test at .45aw.  WE are now being recommended to batch test each of our batches however I am lost on what "at home" microbial batch I should use and how I should even perform the test being our formula is powdered and our water activity is below the .6aw in order to grow bacteria, mold, yeast.  

Is there an at home microbial test kit that tests cosmetic powders?
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