Mix 1/2 a cup of Elmer’s glue with about a tablespoon of dish soap.
Add 2-3 tablespoons of water and stir. The mixture will start to foam, at which point you can add in your favorite color of food coloring.
Add one cup of baking soda to the mixture and stir. (Keep adding baking soda until you can handle the slime without it sticking to your fingers. You may need a whole box, especially during the humid summer months.
If you do end up putting too much baking soda in, you can add a little more dish soap to thin it out again.