From Longman Dictionary of Contemporary Englishsoda waterˈsoda ˌwater noun [uncountable] DFDwater that contains bubbles and is often added to alcoholic drinks
Examples from the Corpus
soda water• The Council of the society rewarded him with the much coveted Copley medal for his work on airs and soda water.• Wash the interior with baking soda water or mild detergent.• He topped up his drink with soda water and carried it with him into the bedroom.• All three were drinking whisky, barely moistened with soda water, with a rapidity that had ceased to startle their friends. 