And don't forget that near me they are working on getting gas out of what would be uneconomic coal mines by partly burning it underground... it generates a lot of waste water that is almost suitable for drinking with a little cleanup - and Australia is a dry country, so such things as lots of 'free' water are very enticing. Toowoomba has lots of gas - supposedly just air - that is pressured into the town water supply - have to let it stand to get clear water.

I've found that Kaolin Clay in suspension eases gas - it's getting more difficult to get it easily from chemists cause the big companies want to get money for all their cute patented goops, but is is 'natural' and fairly cheap - you could even try the potter's supplies - even parrots in the wild eat it to deal with the after effects of eating various berries....