This invention relates to a nutritional kit for use in preparing an individual for a predetermined activity which requires a clean digestive tract, particularly the colon. Such predetermined activities include, but are not limited to, gastrointestinal surgery and colon screenings. Specifically, the present invention provides an individual low amounts of fat, dietary fiber and solid food content to minimize stool formation and/or facilitate removal of stool from the digestive tract prior to the predetermined activity. The present invention also provides the individual with sufficient calories and nutrition to enable the individual to conduct daily, routine activities while utilizing the present invention. In one alternative embodiment, the present kit provides a variety of pre-packaged, ready to eat or easy to prepare nutritional liquid or solid foods which when coordinated with a laxative regimen, result in removal of residue such that a medically and/or diagnostically useful procedure can be performed on the digestive tract.