It is made by Aspects. I found it at a local store some time ago, but here is the webpage about it: http://www.aspectsinc.com/2_Hummingbird.htm
The nectar is one part sugar mixed with four parts boiling water. Dissolve, cool and pour in. Any nector I'm saving for the next clean nector replacement goes in the refrigerator.
To answer Julie's question posted in the comments, I've never used food coloring. This feeder is colorful enough! If you have a feeder without color, you could hang something bright with the feeder to help the hummers find it the first time. Once they find a good source, they'll remember it!