Hummingbird nectar can be purchased in many stores, but if you prefer to make your own, the recipe is easy.
Simply bring 4 cups of water to a boil, then dissolve 1 cup of sugar into the water. Remove from the heat and LET COOL before filling your feeder. Different quantities can be prepared with this 1/4 sugar to water ratio.
You will want to replace the nectar once it starts to get cloudy, which means it has been out in the sun too long and has started ferment.