The chem prof way back said it was quite easy to make vodka out of crude oil, turning ethane into ethanol, but marketing it would be the problem.
More recently, one of Anthony Bourdain's trips to Russia or the Ukraine had some chef pitching vodka made out of chicken feces as a business venture. Methane to ethanol not much a problem, either.
Tertiary water treatment where you can drink processed water from sewage out of the tap has been around since the early 1970s. It even caused a problem in a Long Island cove from dumping too pure water into the cove, killing off sea life from the lack of nutrients.
These days I usually drink one of Sierra Nevada's brews, or local Kona Brewing's if I can find it for a reasonable price. You'd think it would be reasonable, but they have to ship it to the mainland to bottle it.