Yeah, believe it or not, those stop valves you see at every fixture are NOT REQUIRED by code. Code only requires two shutoffs. One at the water heater; a second valve to kill the main water. You shoudl have a shutoff somehwhere in there..probaby in the utility room. If you live in a condo, ask your super. He should be able to help you. if you have no shutoff, while the water is off, go ahead and install one now. In fact, if you don't have shutoffs at every faucet/kitchen sink/toilet, install them now. They are EMERGENCY stops. You'll think you wasted your money installing those damn stops until one of those little stops makes the difference between a major flood vs. the small inconvenience of mopping.