Well, I have never made a Mist kit. I can't tell you for sure what it is going to turn out like. The F Pack is to sweeten the wine after it is stabilized as it will ferment to dry. If you haven't tossed it yet and have the carboy space to experiment then let it ride out its fermentation. When it is done fermenting and it is time to stabilize, follow the directions and stabilize and degass.
Give it a taste. It is going to be dry more than likely. You can then experiment with back sweetening to see if it is something you will drink. If not, you can toss it. All it is going to cost you extra is a bag of sugar to make the sugar mixture to back sweeten. Or you could use some Wine Conditioner which is basically a sugar solution. Some sweeten before adding the clearing agent, some wait until they are ready to bottle. Some wines will cloud up when sweetened. Some wont.
Like I said, I don't know what you are going to end up with but it might turn out to be something drinkable. It is not going to turn out like it is supposed to though. If you are wanting the particular characteristics of that wine kit and won't be happy with anything else, all I can say is dump it and live and learn. I can't stress the need to follow the directions to the "T" until you have a few batches under your belt (this includes everyone involed in the process, beat them with your spoon), use the proper equipment to make the kit, have done some research on overall wine making and have a grasp of what might happen or what will happen if you modify a kit.
Good Luck and continue to ask questions as needed.
Smurfe
