You can purchase the oil filter wrench for your car from a number of places to include this site(perhaps?) or:
http://www.************************
or you can simply take your Knecht/Mann/Hengst filter down to Pep Boys/Auto Zone/whatever and buy a spin-on filter wrench that fits. Turn it down hand tight, then give it just a bit of snugging up. Don't forget to coat the oil filter gasket with oil before installing.