Mix 1 cup cornstarch with 1/2 cup warm water in a bowl
Stir until smooth
Add more warm water a tablespoon at a time if too thick
Add more cornstarch a tablespoon at a time if too runny
Optional: add food coloring and mix
Optional: add glitter and mix
Optional: add a few drops of essential oil or vanilla for scent
Optional: knead briefly by hand until the texture feels right
Store in an airtight container between uses