Avoid the plastic-bottled stuff to save the environment. Straight from a city tap if you have no objections to chlorine and fluoride. From a rain tank or tap, triple filtered. Out in wilderness - from a mountain stream or waterfall. Where in doubt, boil vigorously for one minute.
Buy and fit a Reverse Osmosis Walter Filter Papa Bear.....they are easy to fit and maintain.....You get 99 point Something pure water and then buy a soda stream and get some bubbles in yore water.....it's a bit yum .....:)
No need. I have a new American business selling dehydrated water. It comes in aluminum cans. Just add water - no confusing, messy recipe to follow. Shall I put you down or a dozen? The special this week only: two twelve packs for $3.99, normally $2.99. (It's special for us, not you.)
Speaking of.....I had this Amazing Rocky Mountain sno-melt Kambucha. So they used the mountain snow water to put the fermented mushroom ingredients in. I think the flavor was some fruit I liked, then it is fizzy and the liquid tasted like snow. It really did.