This is a great easy art exercise for your kids as well.

Slime Ingredients:
100mL Elmer's white glue
1 Tablespoon baking soda
1 1/2-2 tablespoon of contact lens cleaning solution, more if need be
Food coloring (optional)

Procedure:
1. Add food coloring and glue in a bowl, and stir until all is combined.
2. Put the baking soda, then mix.
3. Add the contact lens cleaning solution. If it's too sticky, add 1/2 tablespoon more solution at a time. More solution, the thicker it gets. Less solution, the slimier it gets.
4. Knead the slime with your hands. It'll get gooey at first but about after 40 seconds it will all get together.

Store in a container with lid.