Add sugar and water in a small bowl and mix everything until you have a rough,chunky mixture.
Divide the sugar mixture into separate small bowls and add different gel colorings into each bowl.
Mix the color thoroughly into the sugar mixture with a spoon.
Spread the sugar mixture on a cookie tray. Use your hands to really push down the mixture tightly. Then, press your small cutters into this mixture.
Now, remove the cutter from the mixture and gently place it on a sheet of wax paper. Tap the cutter lightly and the sugar piece will just come out.
Let the pieces dry overnight on the sheet of wax paper or until they harden. Once they are hard, you can store them in a plastic container away from moisture, humidity and sunlight.
Instead of cutters, you can use a small candy mold. Fill the molds with crumbly sugar mixture and let it dry completely (overnight is best) at room temperature. Then, flip it over gently onto a sheet of wax paper/ parchment paper and the cubes should fall out easily. Enjoy!