The beer ban in Bangkok is confirmed to extend to April 30th, with some locals suggesting that it might be available again on May 1st. In the meantime, there are suggestions and rumors about alternative places to procure alcohol, although this may not be completely legal. The community is actively discussing updates and sharing insights about the situation.
I know a convenience "store" way down on Sukhumvit under a set of skywalk stairs where factory workers hang out after their shifts to grill on a hibachi and play dice... You can't actually go in, but the metal gate of the store front is open wide enough to pass things back and forth. I am pretty sure they are still selling beer.