I am an expert at catching butterflies. In the summer, I catch about 20 each month.
Nets are important utensils for catching butterflies - the main thing that you use, at first, to catch butterflies. Try to get a net that you are comfortable with. I like my wooden one. It's very nice to have a new net each year. If you get a hole in your net, don't try to sew it up - get a new one. A nice new net is comfortable for you and the butterfly.
You can also use your hands to catch butterflies, although a net is much easier. But, if you don't have one, cup your hands as though you are going to get a drink, but upside down, and gently place your hands over the butterfly. Then put your fingers together and make sure there are no cracks.
For containers, look in your recycle bin. You can find old jelly jars, or other containers. Make sure that you have small holes in the top so that the butterfly can breathe. If its a jelly jar without a top, you can put some old screen over it with a rubber band.
You can feed butterflies by putting a Q-Tip in Gatorade. Then hold the Q-Tip up to the butterfly's feet. Butterflies taste with their feet. Once they taste it, they will climb on.
Wish you were here!