Homemade Gak
-2 (4 oz) bottles of Elmer's glue
-1 teaspoon Borax (found in the laundry detergent aisle)
-Water
-Food coloring
You can find the super easy recipe here.
We just made half of a batch (only using one bottle of glue) and it has been a perfect amount for my two oldest to play with while the younger ones are napping.