2 black bananas, peeled and smashed
1 tablespoon molasses
1 tablespoon brown sugar
1/3 cup dark beer (more or less to make the mixture “soupy”)
Mash ingredients together and allow to sit UNCOVERED overnight to ferment. Spoon small amount into a shallow plastic lid. If you make it, they will come.
Use canned fruit nectar as an alternative to flower nectar. To successfully serve canned fruit nectar, pour some into a plastic bottle cap or saturate a tissue in it and set it out in a butterfly feeder, on a porch railing, or somewhere similar.
Give pollinator sugar water if you don't have any nectar. This acts as makeshift nectar. Mix 1 part white cane table sugar with 4 parts warm water until the sugar dissolves completely. This should provide nutrition and energy for your butterflies so that they can thrive. White cane table sugar provides the best nutrients for butterflies and also dissolves easily, compared to other forms of sugar.
Feed butterflies, native bees etc. rotting fruit as an alternative. Slice up some fruit that's going bad to give to your pollinators. They especially like to eat rotting grapefruits, oranges, strawberries, peaches, nectarines, apples, and bananas. Add a little bit of water or fruit juice to your sliced fruit to keep it desirably moist.
The best way to feed butterflies in nature is to buy or create some sort of butterfly feeder. You can do this is several different ways, whether you want to hang a plastic water bottle full of food from a tree, or set a shallow plate with a base among your garden. Get crafty and make a desirable feeder to draw in as many butterflies as possible.
Provide skewered fresh fruit when you have several butterfly species. Fruit serves as an adequate food source for all different types of butterflies, so this might be the best option if you have a variety of species in your habitat. Take a skewer or a piece of bamboo and slide chunks of fruit onto it. Then, set it in the habitat. If the fruit won't stay on the skewer, secure a bread twist tie underneath the bottom piece of fruit.