Abstract: A GRAS list chemical composition (containing only GRAS list approved ingredients) including a water-based bowel cleansing solution (either in concentrate form or diluted form) to clean a gastrointestinal (GI) tract before and/or during performance of an endoscopy procedure such as a colonoscopy, enteroscopy, upper gastrointestinal endoscopy, and small bowel capsule endoscopy, for example. The GRAS list bowel cleansing chemical composition includes at least one of a chemical composition as a liquid, tablet or powder concentrate that can be added to sterile water or other solution by the end-user to make the chemical composition solution; and a pre-mixed chemical composition solution diluted in up to 1000 ml of sterile water.