Nectar is the essential ingredient to any hummingbird feeder. "Hummingbird Nectar" is 100% pure-natural nectar, which is high energy hummingbird food.  Preparation is simple; just mix it with water.  The real secret is to put just enough in the feeder because the nectar will spoil over time.  Also, do not put food coloring in the solution because these additives do not agree with the digestive system of the hummingbird.  The red feeding piece, as well as the sweetness of the nectar is all  that is needed to attract the hummingbirds.  One box contains 10 oz. of nectar.