I often recommend that people should try fasting for a day or two and drink distilled water to cleanse and detoxify their bodies. Distilled water is essentially the "cleanest" or most pure form of water(H2O) available for most people as the majority of pollutants(bacteria, metals, harmful substances) have been removed via the distillation process. One can generally find distilled water at larger grocery stores(I am very proud of our local store as they have distilled water on display!)

If you have never cleansed your body then detoxifying is recommended. I also recommend researching the many benefits of detoxifying your body!