I stopped posting on these forums in the summer. I now only return to post update pictures in my gallery of my red marks and scars. I've been clear of acne since August or September, but I still get a few pimples here and there (these are just not acne-related, as they are not consistent or regular). Aside from the scarring, red marks, and minor flesh bumps on my forehead (due to my picking and scratching habit I've yet to fully break), my skin looks and feels fantastic.
I just wanted to let others know how I did it, and just let everyone know that it's a long, hard battle. You won't clear up right away. It took me a number of months of not using skincare products and doing water-only with a washcloth or Caveman to get my moderate to severe acne down to mild, and after that another 2-3 months for the acne to completely clear up. I didn't have skin I was really happy with until 4-5 months on water-only. And there are going to be unpleasant hurdles to deal with, like increased oiliness, redness, itchiness, clogged pores, flaking, dryness, dead skin, etc. So it's something you have to commit to for at least 2-3 months, and commit to it without making any changes whatsoever.
For water-only, I don't recommend going out of your way with it. Just take your shower like you normally do and that will be when you wash your face. You don't need a filter, you don't need to monitor the temperature unless you also do so for your body, and you don't need to time how long you submerge your face in water. Just stop thinking about it. Keeping your mind off of it and not stressing over it will make a huge difference. Just live your life as though acne is not an issue, and things will hopefully fall into place if such a routine works for you.
Anyways, if you want to know more about my water-only routine, I have a closed log with a bunch of Q&A on the very first post, so that might help answer some of the questions asked lately. I've been water-only for my whole body as well, and my hair, and it's worked wonderfully. My body was (and still is a bit) dry when I started, got really dry for a good 6 months, and then looked just fine. It gets a bit flaky on my legs, but other than that my skin looks and feels pretty normal. I also have a gallery which you can check out to see my red mark progression, which starts about 2 months after my acne had gone back down to mild and some of the redness had started fading.
The best of luck to all those who undergo water-only or Caveman, although I do suggest water-only over Caveman. I really hope everyone will be able to find their "cure," as well as having a great Christmas this year. I will not be replying to this, so if you have something urgent to ask me you can try PMing me, but I don't check PMs unless I am uploading pictures.