Either method works fine, though it is more cost effective to make your own, and quite easy. Just add 1 part table sugar to 4 parts hot tap water. Allow the mixture to cool to room temperature before filling the feeder, and refrigerate any unused portion for up to two weeks. A few notes about water temperature and sterilized water for making nectar: It is not necessary to boil water for making nectar. Hotter water makes sugar dissolve faster, but that is the only benefit. Therefore hot tap water is the most efficient way of making nectar. Boiling-hot water will dissolve sugar faster than hot tap water, but of course it takes time to boil the water, so the benefit is lost. Similarly, it is fine to make nectar with room-temperature water so you don't have to take time to let it cool, but it will take just a little bit longer (about a minute more) to dissolve the sugar with room-temperature water. Finally, boiling water might sterilize the nectar by killing any bacteria or microbes living in the tap water, but as soon as the nectar is exposed to the outdoors (and the buggy beaks of hummingbirds), the bacteria and bugs will be there - so there's no real benefit to sterilized nectar.