I made it at TechShop (techshop.ws).
Step 1: Safety is always first
Step 2: Obtain materials
-2 small glass jars with screw-top lids (e.g. baby food jars) or small corkable glass container (two corks).
-Cotton balls or cotton string
-Aluminum foil (if using corkable containers)
-Ethyl alcohol (also known as ethanol, this can be found as denatured alcohol in the paints/solvents aisle of most home improvement stores. Additionally, if you are preparing your laboratory for the zombie apocalypse, note that any ethanol over 90% will work, e.g. distilled spirits).
Step 3: Drill holes in the cork
Step 4: Braid a wick and thread it through the center hole in the cork
Thread the wick through the largest of the two holes in your cork or jar lid (this may take some finagling). I used a loop of wire and needle nose pliers.