Sounds like a particularly nasty party! I've been to a few dodgy ones, but I've never been anywhere that didn't have either water or at least beer for sale ;)
There's a good one on this weekend
http://www.squatjuice.com/cgi-bin/ya...num=1067622652
with Ant, Justin Swales, James Kinetec and hardcore from Industrial Strength Records... well technically it's in a licensed venue but it's by squat party systems and I doubt it's going to be "clubby".
There's another one next weekend with Mark EG, Jeff Amadeus, James Kinetec and others which has been posted about in the techno events section as well..
http://www.squatjuice.com/cgi-bin/ya...num=1068433168
There've been a lot of sound systems I've had a decent time with, usually end up at Malfeiteurs or Manik parties though. Try Tribe of Munt, Stinky Pink, Ravenous or Section 63.