In a mixing bowl, combine the baking soda, corn starch, sugar, and cream of tartar thoroughly.
Add a few drops of food colouring to the water and mix thoroughly.
Slowly add the water a few teaspoons at a time, mixing thoroughly after each addition. Be careful not to add too much water.
The kinetic sand is ready when it is light, fluffy, and can form a ball when held. Add more water if needed for the mixture to stick together.
