It does depend on the cause of GERD. It's important to prevent it as much as you can: control weight; limit alcohol, chocolate, mint, tomato sauce, spicy foods; eat small meals; don't eat at night; don't bend over after eating; elevate the head of your bed, don't wear restrictive clothing around the middle.
In addition, apples seem to help some people (just eat a few pieces throughout the day), and bicarbonate of soda helps when you have heartburn but you have to watch the salt content and not overdo it.
Apple cider Vinegar, raw organic honey, a product called GES-5 google all these along with Gerd