Combine 2 tablespoons borax in 1 cup of water. Microwave to boil and set aside. Meanwhile combine 3 tablespoons white glue, 3 tablespoons water, and food coloring of choice in a zip-lock bag. Squish until well mixed.
Then add 2 tablespoons of the borax solution to the baggie. Continue squishing until cool and Gak forms. This cuts down on the mess factor.