Preheat oven to 325 F. Cream butter, sugar and Kool-Aid. Add eggs, one at a time. Mix well. Combine flour, salt and soda, then add to mixture. Roll dough into 1-inch balls. Roll dough balls in sugar. Place cookies 2 inches apart on an ungreased cookie sheet. Bake at 325 F for 10-12 minutes or until the edges begin to brown slightly. Transfer to wire rack to cool.