Make your own antacid
Place 1/2 teaspoon of baking soda in 1/2 glass water. Check the antacid use information on the box before using this remedy, however. Warning! If you're on a salt-restricted diet, do not use baking soda. It's loaded with sodium. And do not use it if you're experiencing nausea, stomachache, gas, cramps, or stomach distention from overeating.
You can also mix 1/2 teaspoon of cream of tartar with 1/2 teaspoon baking soda in a glass of water. Take 1 teaspoon of the solution as needed.
At the first sign of heartburn, try mixing 1 tablespoon apple cider vinegar, 1 tablespoon honey, and 1 cup warm water.