Pretend Dirt Playdough 2 cups flour 1 cup salt 1/2 cup instant coffee 1/4 cup sand 1/4 cup coffee grounds 1 cup warm water Mix dry ingredients together and stir in warm water. Form a ball... add extra water or flour if necessary. Knead until smooth and store in an air tight container. Add plastic insects for even more fun. Project can be baked (remove all plastic items first) at 325 degrees for 1 1/2 hours, until hard.