Does the country you live in mandate drinking bottled water? Otherwise: can't beat tap water and a reusable bottle in terms of sustainability.
hydrohomies
Stay hydrated homies.
Refuge for homies who quit reddit!
Gotcha, yeah I have a hydro flask that i fill from the tap daily - my question about bottled was sometimes when I'm headed out somewhere i don't want to carry around a huge flask, i'll grab a bottle to go from the garage fridge.
Garage fridge... So you live in the US :D Just don't drink tap water in Flint, Michigan... There are smaller bottles to take with you - take a look at https://www.freshlabels.de/en/products/dopper-original-dop006/ - those are a bit under half a litre.
If your local water isn't safe or you have a well and don't have the right filtration equipment, I'd recommend getting the big 5 gallon bottles for water dispensers. They're much cheaper, and fully returnable and reusable.
Move over to Scotland and enjoy crystal clear, full of minerals, delicious and, on top of that, free tap water <3
Reverse osmosis.
I tried drinking only fiji water for a week last year and by the end i loved the flavor so i'd say fiji.