I had bought 10 pots of peppers a while back. Not all of them seemed healthy, but since they had the fruits, I thought I can use the fruits and bin the pots if I can't keep them. I was keeping them in the north-facing balcony when I noticed they're all covered in small pink/brown bugs. I applied alcohol + soapy water spray to get rid of them, and then planted them all in a box and moved the box into a room with a south-facing window. I also cut all unhealthy-looking leaves and stems.
Since then, they've been growing incredibly, blooming, and now, even having small fruits. The issue is that they're growing curly leaves most of the time, some with dandruff-like spots on them, and I think, as a result of that, some of the flowers fall off as if one has cut them. Consulting someone at a gardening store, I bought a tomato food to help them grow better, but I couldn't manage to find a fungicide spray, and even if I could, they'd come in giant quantities.
Is there something like the soapy water that I could make at home to apply on these plants as they're full of flowers, and I don't want to bin them all, but to cure them!
P.S. I've moved the box away from the window just to take the photo. This is not where it normally rests!