Prepare the marinade by combining the bourbon, thyme, brown sugar, soy sauce, lemon juice, Worcestershire sauce, water, salt and pepper in a large2-gallon size Ziploc bag and shake to mix all together.
Place the meat in the bag and refrigerate overnight (4 to 6 hours will suffice if you are in a pinch), turning meat over several times. Take the meat out of the refrigerator about an hour before cooking to bring to room temperature.
Preheat the grill to about 400degrees. Place the meat on the grill and reserve the liquid from the marinade.
Cook over high heat with the lid closed. Turn the meat occasionally while basting it with the marinade. It will take about 25 to 30minutes for a medium cook, but to be sure you get it perfect, use at thermometer. Insert the thermometer into the thickest part of the meat and wait till it reads 125 to130degrees F for medium to rare.
Let the meat rest for about 10minutes after taking it off the grill. Cut the string off the meat and begin slicing to desired thickness.