One thing that has helped a ton is Gaviscon Advance imported from the EU, which contains Sodium Alginate. This was recommended to me by a GI specialist at MGH; the sodium alginate floats to the top of the stomach and forms a sort of physical barrier for a few hours to prevent acid from coming up (alongside other antacids like you'd find in tums). For reasons I don't understand almost nothing is marketed in the US containing it.
The tablets like these (https://www.amazon.com/gp/product/B08GCN88WX/) are honestly pretty palatable - I chew them a couple times and then wash down with water, and it avoids some of the gumminess reviewers describe.
There's also a liquid that I think might find a bit more effective, but less palatable and convenient on-the-go (https://www.amazon.com/Gaviscon-Advance-Aniseed-500/dp/B01N4...).