First off, we have a thread dedicated to MR Beer...Lots of info, tips and tricks and discussions..
http://www.homebrewtalk.com/f39/mr-beer-read-all-about-ask-questions-46360/
Well, leaving it for 3 months was probably one of the contributing factors...that is a long time to sit a small batch of beer on a crappy yeast cake....Additionally, if you followed the rest of the directions, including adding sugar or their booster packet is probably more of a factor in the thin and cidery taste....
Like I said, come join us on the mr beer thread. You can probably figure out what went wrong, and maybe before giving up on the brown jug, get at least one satisfying beer out of it...
