Note that in American English, a soda means 'any carbonated (fizzy) non-alcoholic drink'. In British English we say instead 'a can/bottle of pop/Pepsi/Doctor Pepper/Sprite/Irn Bru/Dandelion and Burdock'.
We also have cans or bottles of soda water, which is carbonated water flavoured with sodium bicarbonate and mainly drunk medicinally or as a mixer/dilutant for spirits like whisky and brandy.
Ha, I just drank a bottle of this last night! Fairly difficult to find here in the US, but I've grown fond of its funky taste. Fentimans also makes a damn fine ginger ale, which is also difficult to come by stateside.
I notice that Fentimans refers to a couple of their other beverages as 'colas', a term also used in the US for carbonated, sugary beverages.