I'm really confused! Do you have fish in the tank now? If you do then you must go by the .002, that is both for the bacteria and the fish. At .002 the tank will recycle once you hit the final amount, but since yours has yet to cycle you will be fine. I don't know anything about bio spira, never used it. Just do the old fashion natural cycling.
I would HIGHLY suggest you purchase a hydrometer (full length) they are only like 10-12 bucks and will save you a ton of money and hassle in the long run. If you opt with brackish fish it is one of those requirements to have IMHO, and I've been keep brackish for over 10 years. Anyway, hope this helps and good luck!