Salt Water Flush Instructions First thing in the morning before food or drink. 1 tablespoon sea salt to 1 Quart of warm water. Drink within a few minutes, then drink another quart of water within 30 min. Do not eat for 2 hours and avoid coffee, tea, or anything dehydrating. Most people experience several bowel eliminations within 1 to 2 hours. If the last bowel movement was mainly clear fluid, this is an indication that you have completely flushed your GI tract.