This is very much a cultural thing. Over here, you can easily get bottled water in glass bottles. The delivery services will pick up your tray with empty bottles to be reused. That's reuse after cleaning, not recycling!
Europe, I guess? I had a talk late last year with a local brewery (traditinal bavarian one, family operated since the 1400s). And apparently everyone, especially Coca Cola, is going for glass right now. To the point reusable glass bottles are an actual bottle neck for them. Mind you, depsite the Covid caused demand drop. That was quite an interesting fun fact for me.
I've found glass-bottled water easy to find in Belgium, I buy cases of Ginstberg (they have both still and carbonated water) in glass bottles in a supermarket here in West Flanders.
I know at least a couple places where you can buy it (Huis Maria in Harelbeke, Vanuxeem in Ploegsteert, so both Flanders and Wallonia) so I would assume those to be widespread enough throughout the country.
To me coming from France it was Belgium that was the easier place to find glass-bottled water :)
Can't you just drink tap water, or if it really tastes that bad use a water filter. The idea of buying a new bottle every time you want a drink of water seems insane to me!
I assumed they were talking about reused glass bottles. Here (so in Belgium) I buy cases of water bottles with a deposit and return them empty.
The bottles are reused, and the water tastes a lot better than at least my tap water (in Antwerp - the tap water comes from a stagnant canal used for merchandise shipping, and last year for example it turned green and smelled of algae for a while after a ship carrying fertilizer capsized).
I have a filter for cooking/making tea. However there's something about S.Pellegrino and others that makes it taste much better. And the filtered water has completely different taste in the first day vs the rest of the month.
And yeah, you usually give the bottles back. However, it's much more common in Germany than in Belgium, it seems. I have never seen a line to give the bottles back in Gent, unlike Berlin.
(a) I used to live in Malaysia where tap water wasn't drinkable as-is, but filtering and boiling made it drinkable and tasted just fine. Hot water dispensers are pretty standard to have in most Asian homes; just put the water through a filtering pitcher before pouring into the hot water dispenser.
(b) Subscribe to those 5-gallon big blue bottles and a dispenser. They get actually reused instead of downcycled.