I would like to strongly recommend that you do not give straight water for the last week. The organic folks have shown us that the plants finish out best and best express their full genetic traits, only when fed strongly right up to the end. Since this time is when the buds are finishing up, the plants can actually use more nutes in that last two weeks than ever before in the grow, but bro science has us all convinced that we should starve our plants in the end. It makes no logical sense to do this. When you see that you are 2 weeks from the end and the buds are entering their final bud swell, do a 3x flush of your soil, just to clear it of any built up salts and left over nutes. This allows the roots to have their full ability to uptake water and nutes during this critical period. Then, feed right up to the day of the chop... even giving finishing nutes if you have them.... and this is when you correctly use the PK. Someday, do a side by side test where you starve one plant at the end and feed the other as I have described.... you will see.