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Sift the icing sugar into a bowl. Add two to three tablespoons of warm water. Consider adding some flavouring. Consider adding some colouring.
Using a sifter, sift 300 grams (10½ ounces) of icing sugar into a large bowl. This is to break apart any chunks that might have formed in the container, and prevent the icing from getting clumpy when you add water to it. You will need to dissolve your icing sugar with some water so that you can spread it over the fairy cakes. Start by adding two tablespoons of water and mixing it quickly with a fork. You want to end up with a somewhat runny consistency so that you can drizzle it over the fairy cakes. Add more water to make the icing thinner, and more icing sugar to make it thicker. You can make the icing flavoured by adding some lemon juice. Use one part lemon juice and one part water. If the icing becomes too thin, then add more of the sugar. You can leave the white icing as it is, or you can add colour to it to match the theme of your party. Add a few drops of food colouring to the icing and stir. For darker icing, use more food colouring. If the icing becomes too thin, then add a little bit more of the sugar.