Then add in the food coloring and stir until it’s the color that you prefer.
Then stir in the cornstarch into the shampoo and a crumbling mixture should form. The mixture will be thick. Then slowly add in the water. Just add 1-2 tablespoons at a time until the mixture is formed into a smooth slime. You may not need all the water.
Then knead the slime until it’s smooth and stretchy.
Notes
Store in an airtight container for bag at room temperature. If the slime dries out when it’s stored, just add a small amount of water to make it stretchy again!