Baking soda, apples, ginger, peppermint and rice can all help soothe upset or sour stomachs, according to WebMD. Papaya and artichoke leaves can also be effective in combating these problems.
A teaspoon of baking soda added to 1 cup of warm water can help lower stomach acids, advises WebMD. Apples and applesauce are also a helpful for the overall digestive tract, as they are great sources of fiber. Ginger can be consumed in different forms such as tea or candied ginger, and it contains phytochemicals that help combat nausea and upset stomach. Peppermint tea and candy can also be effective with the stomach spasms that contribute to nausea and vomiting. Rice is considered a good carbohydrate when battling stomach issues as it is easy to digest and possesses some soothing qualities.