So, Alex, it seems like our situations may be similar. If you get an X-Ray, they can tell you if you have disc compression, which might be likely if you've done lifting. Perhaps the water rehydrated the discs and lubricated them. The "water cure" people claim that a lot of people had improvements with a variety of joint problems after trying it. So I would recommend giving it a try. It's a LOT of water and I couldn't drink it all the first couple of days. After that, however, I just craved more and more until I WANTED that much every day.
I also have this loud creaking / crunching in my knees when I squat down (makes my wife squirm). And that too improved while I was on the water cure. I had knee surgery when I was 18, having blown it out playing soccer. When I was young, I had massive pain in my knee when I couldn't stretch it out (as when I was sitting in the back of a small car for a long time). Strangely, the knee I had surgery on stopped having that problem. Later I learned that my mother had had the same problem. So that might be something genetic. I've also dislocated my shoulder a few times. So I think that I also probably have some genetic joint problems.
I used to do the chiropractor thing, but that seemed to make it worse sometimes. I'd go for a "maintenance" visit, not having had back problems in a while, only to hurt myself a couple days later. I remember this one chiropractor, though, a big heavy guy, who had this ancient equipment in his office that reminded me of Protestant caricatures of Inquisition-era torture devices (I'm sure it could have been used in lieu of a rack, as it had these large metal cranks and thick leather straps). He was brilliant. He looked at me, the way I was walking, and told me exactly how I had hurt my back and neck. He was right on the money. Anyway, one time I was there, this guy laid me face down on a table, ran across the room (I kid you not), threw himself in the air (remember that this was a big overweight guy), and hammered down on my back with his full weight. I was laughing the whole time because this was so comical; my wife was there too and told me that she was awestruck with disbelief. He told me to call him at home if I had problems. Why, I wondered, would I have problems? That evening, I could barely walk, was crawling on my hands and knees, but the next morning my back and neck were as good as new, and I didn't have any problems for a long time after that. He's way too far away from where I live now, so I don't visit him anymore.