Creatine water weight?

How much water weight do you all think i would gain if i used Creatine(just basic Creatine) for 3 weeks? If ya could can you tell me how much you think i would gain if i worked out like none while taking it. And if i worked out. Im not worried about the muscle gain quite yet. I just need to make a weight limit and am hoping the water weight will help me do that. I am 6' 1" and 144lbs. Thanks :)