Well, if that water company is producing and selling water with the foreknowledge and intent to aid something that encourages this behavior, then yes, they would hold some culpability. If ravers just order some bulk water and the water company doesn't know, then no they don't.
I'm sorry, but your logic is the same as a parent that says 'well, kids are going to have sex, so i'm going to give my kids condoms instead of teaching abstinence'.
And yes, the music is actually a central part of the rave. The music is aimed at fueling the experience. This is why you don't hear Celine Dion and Whitney Houston singing ballads at raves. Because that wouldn't make the experience the same, it would change the dynamics. The music is an integral part of the rave. The core points of raves are drugs, sex and... music.
Sounds to me you are doing what most people do when they come to this site with a question. They ask, not for advice, but for someone to justify what they have already decided, even though their conscience bothers them. I've seen people get one answers telling them what they are doing is wrong, and one answer telling them its ok and they side with the one person. My thought is if you're feeling a need to ask at all, that should tell you something. But it's evident you aren't really seeking real advice, just support in defying your conscience.
So if the water company is would be guilty for supplying ravers with water, does that mean God is guilty when He lets murderous people eat? "God sends rain on the just and unjust alike" And there is a Scripture about feeding one's enemies, too. Coals of fire and all that.
It's not that I'm trying to ignore my conscience. I have mental illness. A VERY serious one. Also, I'm pretty sure I have PTSD after reading over the symptoms on wikipedia and considering many things I have gone through. So, combine those two, and I cannot usually ever be quite certain that anything I think I can be certain of I can actually be. Which is why I come asking for input, because not everyone has mental illness, and not everyone has such a hard time discerning right from wrong.
You are correct that the music is a big part of a rave. But imagine this - what if there was no music, and everyone was on ecstasy? What do you think they'd be doing on the "dance floor".
As for your comment about abstinence; it's good if one can manage it, but if you know your child is in fact going to be having sex I think condoms are definitely in order. Is it better to experiment with sin at a young age, incapable of parenting (basically), and bear no children, or is it better to fail at abstinence and create a life which will almost guaranteed include much suffering (or an abortion)?
I know there are tons of bad things that happen. It is not my intent to create music to go around and be lude to. However, it could happen, indeed it may. Someone could read a Bible and come up with all kinds of ways to be evil. Did God sin, then?
I just want to know if God is going to hold me accountable if people do things to my music that I am not intending it for.
Should a car manufacturer who makes a very safe vehicle be held accountable when someone drives irresponsibly and gets hurt? If someone decides to fashion a club out of a branch of a tree and commit violence should we ban wood from the populated areas?
See, these are all good arguments against my guilt in such a situation. And yet I still have doubts, though less than before. But no, I am not trying to ignore my conscience or take the easy way out. If I didn't care, I wouldn't be here to begin with.
edit: One time my conscience told me I had to give CPR to rocks because I believed at the time God was so evil He was starving them of air and it was my duty to provide as much as I could while the rest of the rocks in our back yard went without. I obeyed my conscience then. Mental illness is awful, at times.
edit two: You said "if you feel a need to ask that should tell you something" - my reply is that if people feel they need to ask it is because they need guidance, if they're not doing what you accused me of