 1. Begin a clear liquid diet at breakfast and continue this diet until 4 hours before your procedure. A clear liquid diet includes: water, tea, black coffee, clear broth, apple juice, white grape juice, Gatorade, soda, Jell-O. Do not eat or drink anything red, including red Jell-O. Do not drink milk. Do not use sugar-free drinks. All patients, including those with DIABETES, should be sure they get enough sugar during this time. 