Turn to lemons
Lemons contain citric acid, a naturally-occurring compound thought to aid digestion and soothe the stomach. Try adding freshly-squeezed lemon juice to water and sip throughout the day.
If nausea is due to constipation, drinking warm water with lemon juice may stimulate your bowels. Go easy, though. Ingesting too much lemon juice in a brief period may make nausea worse.