LaMotte's BrewLab Basic Water Testing Kit is a great way to get started with testing your water for the most important brewing parameters. Comes with a handsome zipper-closure carrying case, reagents and chemicals, testing apparatus, and instructions. Most tests can be run at least 50 times.
Test for five factors:
Includes calculations for Magnesium Hardness and other resources.
Total alkalinity indicator has a six-month shelf life, but other reagents will last for at least a year.