i thought it would be the hardest thing for me to give up i used to call it champagne but i've hardly even thought about it.
i think the reason for not having it is its got citric acid in it which can affect ketosis.
i drink a lot of sparkling water now only about 17p for 2 ltrs from most large supermarkets, can add flavourings as well.
have heard coke zero is ok though,