I had horrible burping and belching because of fructose malabsorption and SIBO. Went up to Mayo, and they diagnosed it and gave me a few tips:
Don't drink out of a straw, and don't drink out of a bottle because you ingest a lot of air both ways. It didn't solve the problem totally by any means, but it sure helped. Now in the car I use a straight sided canning jar with a plastic lid. If you have trouble getting the gas up, you can swallow a bit of air to "meet" it and often it all will come up. I've also discovered that drinking a swallow of water will often displace the gas and help it to come up.