There should be someplace locally that sells an OTO/Phenol Red kit. K-Mart, Lowe's, etc. Even a pool store ----- but don't let them talk you into buying anything else while you are there!

In regards to dosing: In a 16K gallon pool, each quart of 8.25% bleach will add about 1.3ppm of chlorine. Each of the 121 oz jugs will add just about 5ppm. Use those values as references to help you figure out doses. Your shock level and needed maintenance chlorine levels are based on your CYA reading. Take a look at the Best Guess Chlorine Chart for more about the connection between the two. http://pool9.net/cl-cya/

Once you get some good numbers, someone here can help you determine what you need to do next.

Hope this helps.