I think what needs to be done is for the cities and states to re-establish the municipal water supply. While everyone is drinking bottled water, the companies (Coca Cola, Pepsi, Nestle, etc.) are charging more than 100x the cost of water and are making a huge profit on what was once a rite, not a luxury. Also, they pump hundreds of thousands of gallons of water per day from local groundwater. They buy cheap land and pump until there is nothing left. Their pumping depletes local lakes and rivers. They even pump throughout drought. Think about this: if some Coca Cola representative came and scouted my land (and dressed as a civilian), he could purchase our house for about $175,000. Then, he could bring the company trucks and pump all the water he wants from our well and make millions in profit. I'd never be the wiser and a water source I've cherished having for so long would be depleted in weeks. If I ever found out, I wouldn't be able to do anything.
What they continue to do is pump public water, filter it once, and then sell it for a massive profit, no matter how much it affects the community. What they do is abhorrent and they are proving that they can monopolize water for those who can afford it without consequences.
While I don't believe tap water is that great, I think with work, it will become more efficient and cleaner. The work it takes to fix water systems costs less than what it costs people to buy bottled water. In Singapore, they have come up with an entire system that recycles water. No sewage water is ever released into the sea. Instead, NeWater provides Singapore with 30% or more of their water. This kind of system would make us reuse our water and it would be clean and safe. We wouldn't be forced to purchase millions if dollars worth of bottled water daily.