Pour glue into a medium size bowl. Fill your empty glue bottles with warm water, replace cap and shake the bottles (this will help loosen any residue glue). Pour the water in your bowl and mix with glue. You'll want to add your food coloring at this point. Stir until the water, glue, and food coloring are mixed evenly

In a small cup mix 1/2 cup warm water with 1 teaspoon borax until dissolved.

Pour borax water into glue mixture and stir together. As you keep stirring the slime will thicken. After about a minute you can remove it from the water and use your hands.

Store in airtight container.