Upset tummy? Reach for peppermint water. It contains menthol, eugenol and anethol; compounds that enhance digestion, plus prevent and treat gas, stomach cramps and bloat. Experts add that peppermint even eases more serious concerns such as chronic constipation, nausea, motion sickness and irritable bowel syndrome. Simply spike your cold water drink with a leaf or two and you're good to go.