In our community, we have excellent water. I have no idea what makes it so good, but it tastes so clean & pure & fresh.
So, most of the time, we just use tap water - although it's filtered through our refrigerator filter system.
Our water is the main thing I miss when we travel.
We do buy bottled water when we travel, for swim meets, & various other excursions/activities, & we usually buy the Publix brand. However, sometimes, we'll buy Dasani if we're tired of the flimsy, thin Publix bottles & want/need sturdier bottles. I like the Smart Water brand too.
I always have water w/ me! Before I leave our house, I fill up my Yeti w/ ice & water from our refrigerator. However, like another poster mentioned, when did we get like this? Growing up, I can't remember anyone ever having his/her water w/ them all the time.