Pack the watermelon into each mason jar until the jar is filled to the rim. Pour in one tablespoon of sugar and fill the jar to the top with vodka. Screw the lid onto the jar tightly and gently shake the jar to agitate watermelon and the sugar. Store the jars in a cool, dry place, or the refrigerator, and agitate them every day for about three to four days. Strain the liquid through a few layers of cheesecloth to remove the watermelon and the seeds. Serve.