What do you put in a hummingbird feeder?

Dissolve 1 part sugar in four parts water. A part can be any volume as long as you use the same volume to measure both the sugar and the water (1/4 cup sugar to 1 cup water, 2 tablespoons sugar to 8 tablespoons water, 1 yogurt cup sugar to 4 yogurt cups water, etc.). Red food coloring isn't necessary and may be harmful to the birds' health.