Is there a trick to make hummingbird food sugar water?

one part plain white sugar to four parts water. that's it. no honey, no brown sugar, no red food colouring - the feeder does the attracting. warm water just helps it dissolve, let it cool before filling. the part people get wrong is the cleaning: in hot weather change it every couple of days, because it ferments and goes mouldy faster than you'd think.