Re:Plumbers advice. (Score 3, Informative)

Shutting off the water is just the first step. Open the lowest tap and let the system drain. Fill the drain traps and toilets with antifreeze solution so they don't freeze up and crack. I don't know how you heat your place but gas furnaces and water heaters have a "vacation" setting so check your heat sources. A couple of light timers would be handy to make the place look lived in. You should also check with your insurance company as many policies state that the dwelling must be occupied to be insured, or at least checked by a responsible person daily. Don't forget to let your mailman, paperboy and local cop know that you are going to be gone for a while. Good luck with your endeavors.