how do you make hummingbird nectar?

i am sitting outside writing posts for my various blogs and the ruby throated hummingbirds are buzzing all around me! they seem to alternate guarding my new feeder for themselves: sitting on a branch til another hummer approaches then chasing them off with a chirp. the video above, from tharulla, illustrates perfectly what im seeing and hearing! they share the feeder with much reluctance with the carpenter bees however, giving them as much space and time as they want. my nectar mix is getting low, so i was wondering if i could make it myself. 1-part granulated sugar to 4-parts water boiled and cooled without food coloring seems to be the consensus for maintaining healthy hummers. raw honey or turbinado sugar would have been my guess, but honey promotes the growth of microorganisms that could cause disease in the little birds, and raw sugar has too much iron which can be deadly to a hummingbird. so, into the kitchen to make my tiny woodland friends a delicious energy drink!