I wash my vagina w/ water often. the water container i use has black things in buttom that looks dirt.can this cause infertility,cancer or infections?

No: As you know, you would be better off using clean water. However, what you described is not likely to cause you any harm. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Drink enough water daily so that your urine is mostly colorless. Practice safe sex. Get HPV vaccine.