I'm not familiar with the BT Cruiser, but in our class a sunvoyager, the water pump is near one end of the water tank. Follow the hose from tank to pump. There should be a "T" with a line going to the bottom of the compartment and a blade-type valve that you pull up/open to drain the water.
I actually have 2; one on either side of the pump. I open both in prep for winterizing. the 2nd drains your water lines in the coach (be sure to open the faucets). Don't forget to drain your icemaker! (access via the external vent panel). Also, after isolating/bypassing the hot water heater (under kitchen sink), remove heater drain plug accessed from external vent panel. Turn the circuit breaker/interupter switch to OFF (behind the external vent panel also). You don't want the element to ever be turned on without water in tank.
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