I only buy the really good sturdy bottled waters. One that fits in my car's cup holder snuggly.
Then I use the bottle for at least 6 months refilling it with RO water over and over until I either lose it - or it has "expired"...
I am a fan of Snapple Peach Tea, which I buy in the quart-ish size... I re-use those for water, though they do get ganky after a month or so... They get washed and disinfected with chlorine, but when you start smelling mold in the cap, disinfection won't help much... Just about time to buy new ones.
But I am still rigged for the woods, where I carried a canteen and a bottle, both stainless steel, and able to boil water in the fire.
My main jug now is a Kleen Kanteen stainless steel 20 oz wide mouth bottle. It gets coffee in the morning, and sweet tea in the afternoon. Always. It is forever with me.
So I bring my own spring water with me, if I go anywhere. I am still bag-oriented, and that 20 oz jug is in a sleeve in that bag, anywhere I go. So 90% of the time, I am drinking artesian spring water.
But all my life living here, I can drink right out of the streams, most anywhere , other than lakes and behind beaver dams - Though most lakes too. I am pretty immune to any of the critters living in the water here, and only boil if I am worried about it, which is seldom. Clear, clean water is everywhere, just coming out of the ground.
But it wouldn't matter where I am... If I am carrying in stainless steel, I can boil, which is what I would do, anyway... Stopping to boil is always time for coffee, which is always a good thing. So that is just built in break time, the way I am.
Anyhow... Water is an abundance. I can't say I have never bought bottled water, but it has been so seldom that I can't rightly recall it much. I just won't even see the option.