Dude all you need to do is evaporate the water. Ever get a vial of ketamine? It will be just like that, I pour the ketamine into a ceramic plate and put it over a steaming pot on the stove, after a while the liquid has evaporated and you are left with a powder.
Now how you decide to evaporate the water is up to you, be creative, but yes you will definitely be left with a powder after you evaporate.
Dont waste 5 g's of coke lol.. you can DEF get it back