In a large bowl, beat egg whites and lemon juice with an electric mixer until frothy.
Add icing sugar to egg whites and mix on low until blended. Increase speed to medium-low and beat for 3 to 5 minutes, until mixture is uniform and glossy.
Divide icing into bowls, one bowl for each colour you plan to make. Add food colouring for desired colour and mix completely.
Add water, little by little, if you are looking to create a thinner consistency for your icing.
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