To make hummingbird nectar, mix four parts water with one part sugar, and bring it to a boil. Let it cool to room temperature, and then fill a clean hummingbird feeder with it. Refrigerate any unused nectar.
Always use real sugar rather than artificial sweetener or other substitutes. Hummingbirds may prefer cane sugar, so use that if possible. Let the mix boil for a minute or two, but do not let it boil for too long because too much water may evaporate, leading to a solution that is too concentrated. Do not add food coloring, which is unnecessary as long as you have a colorful feeder. Change the solution frequently, and wash the feeder thoroughly before adding fresh nectar, because sugar water can ferment and grow harmful bacteria.