Unwanted visitors

This might seem like an odd question,but here goes...
I have a lot of indoor plants. All replanted in fresh dirt with proper drainage. I seem to have brought in tiny nats on or in one my plants in the last month or so.Almost like a fruit fly only not quite as big. I have tried spraying all plants and dirt with organic bug spray,but it is one that has to make contact with said bug to kill. I guess I am not making contact with all. Yesterday I bought vinegar and spray bottle...my plan is to mix vinegar and water and mist all dirt and plants hoping to kill my little pests. I'm pretty sure it will not hurt the plants. NOW for the question..Can anyone tell me the ratio to mix to get the strength I need to kill nats,but not my plants? Thank you so much ahead of time for anyone willing to help :)
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