1/2 cup white school glue
1/2 cup water
Food coloring, optional
1/2 teaspoon baking soda
1 to 2 tablespoons contact lens solution
Mix the glue and water in a bowl
Add food coloring if desired and stir
Stir in the baking soda
Add contact lens solution a little at a time
Mix until the slime starts to form
Knead the slime with your hands until smooth
Add a little more contact lens solution if the slime is too sticky
Store the slime in an airtight container