firstly, "he was got drunk that night" is INCORRECT! i am assuming that sentence originally was intended to read "he got drunk that night." if so, then the meaning is "he became drunk that night." hence, there is no indication for the use of the passive tense. additionally, "he got drunk that night" implies that he doesn't get drunk every night so that's at least that's something good to take out of this! haha ;P

No. However, "He was drunk that night." and "He got drunk that night." are both grammatically correct sentences though they have two different meanings. I'm not sure what you mean by passive voice...sorry.