How do I revive this plant?

We bought a chili pepper in an open morning market in the main city square (Zagreb). It was doing great. It still is in a way. We’ve already taken some of the peppers and put the to dry. Some others now are still turning red, getting ready for the picking, but the problem is: the plant is withered!
I assume lymph is still flowing, since its fruits are still developing, but the leaves are now completely dry and the stems are quite sucked in, too.
I’ve transplanted it three times. first time from the cut bottle it was sold in.Then to a wider pot, but after having watered it excessively I suspect, I gave it another home with new dryer soil I took from the woods. It started withering at the second transplant.