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 comp

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.