Consumers develop product preferences based on their own criteria, some of those being relevant and others irrelevant. Me, I prefer new deep blue coloured bottles for some reason.
All of the bottled water in this country comes from urban wells or the tap. All are filtered using reverse osmosis and subjected to UV light to neutralize viruses and bacteria that isn't removed during the filtering process.
As long the the bottles are sterilized before being filled, adequately capped, kept out of the sun and the water processing equipment is regularly maintained and cleaned, the end product should be nearly identical across all brands.
Customers should be able to choose a bulk water product based on price, smell, clarity, availability and delivery with a general confidence that the product is safe for consumption. Ultimately, as long as the water you purchase doesn't make you sick any of the products will do. A bottle of water in this country ranges in price from a low of 25 pesos to a high of 50+ pesos after you purchase the bottle.
Those who wish buy designer water are of course free to do so, but paying the higher price for these products like Dasani (Coca-Cola) is unnecessary.
I have a well that I just do not trust. Lots of organics in the water after several days of rain, sometimes a faint oily chemical sheen floating on top or just the over use of pesticides/herbicides by the neighbors that I know peculates into the aquifer. I use bottled water exclusively for drinking, cooking and brushing my teeth. I do not want the hassle of testing my well water regularly as there is so much variation week to week. I keep that water outside my body and the bottled stuff is for the inside.
Knock on wood, haven't been ill due to water yet (no guarantees though) and I pay 25 pesos a bottle so I do not feel as though I have to ration or conserve it.
In the end, what product you choose should be based on cost, product consistency and ease of access so that you too don't have to give it a second thought. Having it delivered regularly straight from the bottler is the way to go if you can arrange that.