Actually, you have lost 2.2 pounds in two weeks, with your little fluctuation included. That is a healthy rate of weight loss (1/2 to 2 pounds per week)
PWL/LAWL aims for 2 pounds per week, but that is a good week, and just an average. You won't lose that way like clockwork. It is very common to lose 3 pounds one week, none the next, 1 pound the next week, and 2 pounds the week after that. You aim for the averages really, over the course of a month, for progress.
The scale will fluctuate a bit, so don't fret over the small fluctuations. The last time you went to the bathroom, your female cycles, how much sodium you had the day before-lots of things cause small fluctuations. You aren't gaining fat.
Just keep track of your weigh ins, and look at the general path of them over the course of a month, rather than weigh in to weigh in. You can have a drop, gain, drop, gain, drop...but if over the course of the month you are 6 or 7 pounds down, then you are doing fabulous.
Also, I believe that the lemon water is just basically a lemon quarter squeezed into a mug or glass of water. I drink it occasionally at a restaurant when I don't want a soda or tea...but I have never used it for water retention. I guess I never worried about water retention before-because it's normal, and it isn't fat.