Cut a square of muslin and fill with cornflour and tie with rubber band to make a dusting bag. Keep in a re-sealable plastic bag.
Mark all your equipment with a dot of nail varnish.
To help keep your colours from leaking from their tub, spread a little petroleum jelly (Vaseline) inside the lid.
If you want to keep your royal icing a little soft and not too hard for a coating on a cake, add a teaspoon of glycerine.