Should I water at all during a freeze?
Be sure to water thoroughly before a freeze. This will help protect the root system. Plants can dry out quickly during a freeze. If you didn't get a chance to water before the freeze, you can water at the roots. Not the foliage.
Should I cover my plants?
It is suggested that all new plantings and any flowering shrubs be covered. New plants are more susceptible to freeze damage and the cold can also damage any buds on flowering plants. A sheet or plastic garbage bags can be used to minimize any damage. Just make sure to remove them the next morning.
Pipes can freeze too. Cover any exposed piping and cover outside faucets. Home Depot and Lowes offer many products to protect your water supply.