Yes, it is water weight as the glycogen stores are refilling.

You probably won't lose weight while you do this reversal diet (but maybe you will?), the weight loss, if it comes, will come when you resume LC, and the body is once again "shocked" as it was when you first began LC in the first place, with a full glycogen store. It's a strategy that may or may not work.

Please do keep up posted. I hope your tummy holds up under all that fruit!