@jeder@piggo from my experience you can return bottles in most bigger stores (supermarkets etc) but the thing is
some won't have a machine, some will but at a later date? and I think mostly Lidl does have machines to return bottles
and for me an issue is that I can return bottles in my local Biedronka which doesn't have a machine (and probably won't because space) but it's only ones with deposit printed on the label, where I only saw ONE bottle with it.
and then it's the thing with, Lidl only returns in store credit, Żabka does their point thing? and it's just gonna be a mess