I definitely think that you should take the filter. If you have read about the effects on the people who drink the water from the Ganges, you will filter every drop that you drink. Even if it appears that the water is fine, I would make sure to filter it. The risk is too high that you get sick or have long lasting effects from dirty water. Even at home, I make sure my refrigerator filter is changed regularly. Dirty or chemical saturated water is no good for anyone!