I sometimes have small water antiparistalsis orally.no nauseating feeling just small amount of bubble like saliva.what could be the cause?

Acid reflux?: Do you tend to have this after eating/drinking something acidic, like soda, orange juice, or eating something citrus, like grapefruit? Do you tend to have this eating late at night? Please make sure to be drinking water in order to prevent salivary glands from over-reacting when mouth getting too dry. See your medical doctor if these problems do not apply to you....