Start the day with 2 o oz glasses of filtered water.  End with one.  Sometime over the course of the day, take an antioxidant, 25-50 mg B-complex, and 500-1000 mg Vitamin C.  Supplement those 3 morning and evening glasses of water with 2-5 more during the day.

Pack your diet with good fats:  fish, olives, nuts, seeds, and beans.

Filter wash water before using it.   More of the harmful stuff is absorbed through the skin during a shower or bath or doing dishes than you absorb from drinking it.