Just saw this.
The Powerade helped because ketogenic diets cause you to lose extra sodium, which in turn causes a leeching out of other electrolytes. Do drink a good amount of water, but drink more salty. Generously salt your food, drink salty broth, and add extra salt to the Powerade, it really doesn't have very much in it. A cup of bouillon broth has almost 5 times that which is in Powerade Zero.

Extra salt is essential.
And give yourself time for the scale to move. I've found subsequent attempts at weight loss...well your body is going to be a punk about it and drag its feet. Give it some more time.

Good luck.