Living in Australia and I also work as a waitress the term 'soda' means 'soda water' generally we say the name of the soft drink we want whether we want coke, pepsi, fanta lemonade or something along the lines of that. As for Evian, while I like spring water Evain is a bit expensive and not something I drink all that often unless I don't want to drink coke if I wanted to drink water I generally go for cold tap water.
