Esmae When some one like @dfk41 suggests caution re-bottled, I would take a pause.
I do not know much about the bottled. I won’t use for environmental reasons. Waitrose lockhills and Volvic seem the best in the bottled department. But, I won’t use bottled.
Folks elsewhere recommend it. Scales are likely to form eventually and you are going to have to slightly descale often to prevent this becoming a headache later.
Look at this thread. We are spending >1K on a machine, which we want to last for a long time. It’s worth spending some tidy sum, if helps extend the life of our machine - ofc with TLC.
Edit : @DavecUK Hope it is ok to link that thread here.