Bottled water is not the answer. There are no standards for how "pure" bottled water should be other than occasional testing for bacteria at bottling sites. How has the equipment been maintained? Is it truly purified water in the bottle?
Much of bottled water is spring water that is not run through a water filter at all. Some city water is filtered simply to remove the taste of chlorine, which still has fluoride and other chemicals in it.
How long has the water been stored in inventory? Bacteria can be growing in it. Also, bottled water is very expensive.
Many plastic water bottles contain BPA, a toxic chemical that leaches into the water. Some that claim to be "BPA Free", have BPS instead, which is just as toxic! All plastics contain polymers that potentially might leach into the water.
The most convenient and effective way to have good quality water is to set up your own water purifier in your kitchen and a shower or bath filter in the bathroom. Why not have a water purification system that gives you the best water economically?
With your own pure water system, you can have dependably safe water, really pure water, for a cent or two per gallon.