Bring 4 cups water to a boil and stir in 1 cup sugar. Stir to dissolve about 1 - 2 minutes. When cool, pour into the a pitcher or an old pop liter bottle and refrigerate until needed. You do not need to add food coloring. When the weather gets hot (80's and 90's) don't let the food set in the feeders for more than a couple of days. You'll make the birds sick.