And, if they are banging their wings, then place them in a dark area.http://www.learner.org/jnorth/tm/monarc ... gFink.html
Dr. Fink shows how to hand feed butterflies. Keeps the wings cleaner than putting a sugar solution inside the container.
Remember, you may not need to feed until day two or three. I've also seen people use a Q-tip saturated with gatorade. Just put that up to their proboscis.
You can use gatorade to feed them or juicy, juicy (box drink)--10% sugar solution.