My favourite food is French fries and a soda.
[STRIKE]Does[/STRIKE] Is the word is here correct in the sentence?
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.