Drain and discard the juice from the jar of pickles and cut them into chunks. Put them back in the jar. Add the horseradish to the jar and set aside. In a saucepan combine the Vinegar, Sugar and Water and bring to a boil while stirring to completely blend the ingredients. Set aside and allow to cool slightly, then pour over the pickles and horseradish in the jar. Screw on the cap tightly and invert several times to combine. Shake the jar and invert several times over the next few days to mix the horseradish completely. ENJOY!