Mix 1/2 cup warm water with 1/2 teaspoon baking soda
Add 1 to 2 tablespoons saline contact lens solution that contains boric acid and sodium borate
Stir until the mixture thickens
Add a little more contact lens solution if needed
Mix white school glue with a small amount of liquid starch as an alternative activator
Mix white school glue with laundry detergent a few drops at a time as another alternative activator
Mix white school glue with cornstarch for a thicker, less stretchy slime
Mix white school glue with shampoo and a pinch of salt for a simple slime base
Mix white school glue with shaving cream for fluffy slime, then add a small amount of contact lens solution or liquid starch
Add activator slowly to avoid over-thickening