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soda water

Water that has been highly charged with carbon dioxide, which gives it effervescence. Soda water, also called club soda or just plain carbonated water, contains a small amount of sodium bicarbonate, which, because it's alkaline, can help neutralize an acidic stomach. Soda water is combined with sweeteners and flavorings to produce a variety of soft drinks. Many cocktails also use soda water as an ingredient. See also seltzer water.