Hi! I recently bought some herbs for my kitchen. I got mint, basil, parsley and cilantro. They are located on a south facing window and receive plenty of light and sun during the day. I started watering them every other day with 100ml of water and they were thriving!

However, I started noticing Gnats flying around my kitchen so I thought probably it was too much water causing excess moisture, besides the gnats, I also noticed some white spottings on my mint and parsely. So I decided to isolate all the herbs from each other for 1 week and barely watered them during that week hoping the gnats would go away. I also sprayed some natural pesticide to all. After a week, gnats are gone but, white spots are still there but no new spots that I notice. However the herbs are wilting and dropping. I have tried to water them with a mister but it seems to be too little water..so I am debating on what is the proper care. How much water, how often? With a mister or regular watering? I can't seem to figure out the proper balance to keep the soil moist enough without attracting gnats. I put plenty of water on them today hoping they recover but now I am fearing that gnats might come back?! Appreciating any helpful advise!!! Thanks!!! Here is the picture after gnats are gone but the herbs are dropping and wilting

These are the white spots in mint and parsley

They are located on a south facing window and receive plenty of light and sun during the