You can make a simple feeding station for the fruit by placing a 12 inch square of Plexiglas on a post. Change the fruit every few days. You can also make your own nectar solution with a 5 to 10 percent sugar-water solution. Experiment and let us know. We guess yellow but have no evidence to support this position.
Puddles are also a favorite source of nutrients.
Since butterflies can't swim, feed, or rest on water, they won't visit ponds or lakes. They need a place to stand while they drink. A small sand pit kept moist in the garden will do. As the puddle evaporates, nutrients, such as salt and amino acids tend to concentrate in the ground. Males especially need these substances for courtship and mating.