Order the R0013 pint refill -- you can find it on the testkit page: http://www.poolforum.com/pf2/showthread.php/14994

Do you have tabs now? What do you have on hand? (It's best to figure out how to use up what you've got -- it's generally illegal, and can be dangerous, to throw it away.)

How would you prefer to be chlorinating, a month from now?

If you have NO tabs or dichlor on hand, want to use bleach, and have access to a Sams Club, I'd recommend getting a 50# bucket of PoolBrand dichlor. By the time you've used 1/2 of it, you'll have plenty of stabilizer in the water, and your bleach will 'hold'.

Or, if you want to use tabs, get the PoolBrand 24# pack of dichlor shock + a bucket of tabs.

Regardless, it's often cheaper to use dichlor while needing stabilizer, since each pound of dichlor adds about 1/2 pound of BOTH chlorine and stabilizer -- 2 chemicals for the price of one! Obviously, this ceases to be a benefit once you have enough stabilizer.