Best place to start is by purchasing a copy of The Gerson Therapy ISBN 1-57566-628-6
As far as the organic issue, Gerson stipulatated that organic produce is essential for his therapy. This is a mainstay of the protocol.
From page 114 of The Gerson Therapy.."Dr. Gerson required his recovering patients to prepare fresh juices made from organic fruits and vegetables."
To change this is to alter the protocol and it is no longer Gerson Therapy.
From the Gerson website: "The Gerson Therapy is a powerful, natural treatment that boosts your body's own immune system to heal cancer, arthritis, heart disease, allergies, and many other degenerative diseases. One aspect of the Gerson Therapy that sets it apart from most other treatment methods is its all-encompassing nature. An abundance of nutrients from thirteen fresh, organic juices are consumed every day, providing your body with a superdose of enzymes, minerals and nutrients. These substances then break down diseased tissue in the body, while enemas aid in eliminating the lifelong buildup of toxins from the liver."
ALSO
"The Gerson Therapy seeks to regenerate the body to health, supporting each important metabolic requirement by flooding the body with nutrients from almost 20 pounds of organically grown fruits and vegetables daily. Most is used to make fresh raw juice, one glass every hour, 13 times per day. Raw and cooked solid foods are generously consumed. Oxygenation is usually more than doubled, as oxygen deficiency in the blood contributes to many degenerative diseases. The metabolism is also stimulated through the addition of thyroid, potassium and other supplements, and by avoiding heavy animal fats, excess protein, sodium and other toxins."
For more information:
The Gerson Institute — 1572 Second Avenue
San Diego, CA — 92101
(619) 685-5353
888-4-GERSON