Sometimes it's good to be able to use phonetic symbols even if you're not teaching phonetics formally. IPA symbols can be useful for pronunciation awareness, for example. But there are always problems with compatibility of browsers, wordprocessing software and printers across different computers.
Here are two sites for typing with the International Phonetic Alphabet (IPA).
Type it: http://ipa.typeit.org/
You can click on the letters of the onscreen keyboard on either site, or learn keyboard shortcuts to go faster on typeit.