Polluted water

A week ago my deep water bore stopped pumping, as we already deepened it there was just no water, now I find that 630,000 bores in Cambodia have very high dangerous chemicals like arsenic that has and will have a terrible effect on the brains of all who drank the water, they had no option there were no alternatives, so, and I am seeking advice on this matter, to buy a 1 or 2 thousand litre poly tank and have a water tanker come periodically to fill it, a few minor alterations to the house plumbing would ensure shower, toilet, washing machine, cooking and drinking services etc. but try as I may I cannot confirm the purity of the water, if it is just pumped directly from the heavenly polluted Mekong, don't eat the fish full of mercury, if so we are back to square one, advice please.