The night before the colonoscopy can drink water normally, regardless of whether the colonoscopy is done in the morning, but also in the afternoon, for the first night to drink water will not affect the colonoscopy. And the first night of dinner can also eat normally, it is best to eat easily digestible food, not large fish and meat, so as not to lead to indigestion and affect to do intestinal preparation. For the premise of not affecting sleep to encourage more water, can promote excretion. Because good intestinal preparation is the key to a successful colonoscopy, it can be combined with drinking a lot of water before doing the colonoscopy. Its said water is warm boiled water, plain water, not to drink colored drinks type, so as not to will affect the visual field of observation.