Between muscle and fat - a lot, an even mix; I didn't care if it was muscle or fat and didn't do anything to retain muscle. I have a condition such that, for me in particular, protein is hard on my body; so I want to have basically the minimum amount of protein in my diet and, by extension, a low amount of muscle (so as not to have to consume any more protein than is necessary).

As for how much of that was water: my weight still fluctuates with water but in the normal range - 2 lbs up or down, let's say. My weight has stayed in its current range for... weeks now, so I don't think I could call the lost weight 'water weight'.