You can also try these stomach-cooling juices for heartburn relief: papaya, mango, guava, pear. Or run a cabbage or raw potatoes through a juicer for a natural drink to soothe stomach burn.
Buttermilk is also an acid-reliever, but don't confuse it with regular milk, which can be an acid-maker, especially if you are bothered by lactose intolerance.
Soda crackers (preferably unsalted) are bland, they digest easily, and they absorb stomach acid as well.