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Opt for liquids like warm children's juices, colas, and fruit punches. Soak a paper towel with the liquid food and place it in a dish. Pick up each butterfly and set it onto the soaked paper towel. Lower the butterfly's proboscis with a toothpick if it doesn't do so itself. Offer the butterflies food at least once each day.
Children's juices, colas, and fruit punches make for the best first aid treatment for hurt, sick, or young butterflies. Use these as food if possible, and make sure to provide them at room temperature or warmer. Decide which kind of food that you'd like to go with and then soak up the liquid with a paper towel. This will allow the butterflies to eat the food without getting their feet extremely wet. First, make sure your hands are completely dry. When one of your butterflies closes its wings, pinch them together extremely carefully at the tips. Lift the butterfly up and place it onto the paper towel so that it can taste the food on it. Continue doing this with all of your butterflies.  If you aren't gentle, you can very easily seriously injure the butterflies by picking them up. It's very important to be careful when handling them. It's necessary to do it this way because butterflies taste with their feet. Once they're placed on the paper towel, the butterflies will likely recognize that food is available and automatically lower their proboscises to consume it. If one of the butterflies doesn't do this, very carefully take a toothpick or a paperclip and lower the butterfly's proboscis towards the food yourself. The butterfly may be resistant at first and try to push the toothpick or paperclip away. Be persistent for a couple of minutes. If the butterfly is still resisting at this point, stop and try again in 1-2 hours. Pick up each butterfly carefully by the tips of its wings and place it onto the food-soaked paper towel at least once a day. If you struggle to get a butterfly to eat, give it a few more chances throughout the day. Even your butterflies who eat willingly may eat at these other opportunities too, as butterflies tend to prefer spaced out feeding times.