If you are unsure about the purity of the water you drink, buy good, bottled water or consider purchasing a water distiller. It can make up to 4 gallons of pure, distilled water every day. A friend gave one of these machines to his parents when they went south for the winter. His parents discovered that their water supply contained petroleum when they found a rainbow ring inside the distiller. The little distiller saved them from consuming this poison.
Organic food is also more nutritious than foods grown with pesticides.
If you can't buy organic food, be sure to wash your produce carefully to remove pesticides. It is an exceptional cancer fighter. By changing my diet, I lost 20 pounds and gained renewed energy. It, is easy to adjust your eating habits. Just take one step at a time.