Artificial nectar for hummingbirds is made from sugar and water. The ratio to sugar and water is important because the birds require a 21 to 23 percent sucrose content to equal the amount found in flower nectar.
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The ratio for artificial hummingbird nectar is four-parts water to one-part sugar. For example, you would use 4 cups of hot tap water and 1 cup white sugar to make acceptable nectar.
Mix the two ingredients together in a glass or stainless steel saucepan. Place a cover on the pan and set it on a burner over medium-high heat. Stir the mixture until the sugar has dissolved. Bring the liquid to a rolling boil then remove it from the burner. Allow the mixture to cool before placing it a clean feeder.
The birds require real sugar. Do not use a sugar substitute because anything other than sucrose won't help the bird and could potentially harm it.