We also do not eat gebrakts until the last day of Pesach. These both might be chassidish minhagim but I could be wrong about that.
BS”D
Chabad holds as above. Soda – interesting. I think most Chassidim drink only certified soda water during Pesach. One year I bought expensive Irish mineral water and the rav said it was OK, but Rav Blumenkrantz AH mentioned there are problems with carbon dioxide on Pesach.