Catya Washington needs to post at least $50,000 of her $500,000 bail to get out of the pokey -- and thanks to an online fundraiser set up by her family, we're told the reality star already pulled together $20,000 ... in a week.
That means she's still $30,000 in the hole -- but at this rate ... she'll be out lickety-split .. just in time for her court date on November 22.
As we previously reported, Catya wasn't arrested empty-handed -- cops claim she was carrying coke, shrooms, ecstasy ... and even a gun.