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The extra gas in carbonated water creates more pressure in your stomach, increasing the chances that your stomach will regurgitate contents upward. Some carbonated waters also include natural flavorings, such as lemon or lime, which can increase acidic content, making the heartburn worse.
1 Bicarbonate tablets (for example, Alka-Seltzer, Bromo-Seltzer) are recommended to relieve heartburn and indigestion because they reduce stomach acidity. 2  Simethicone (Gas-X, Phazyme) is an OTC medication used to reduce/relieve gas and the feeling of stomach bloating.