My question is I want to use propane for my cook stove. I do not want to put water in the tank for showers and sink. Can I still use the propane?
Yes, you can use propane just for cooking. If you don't want to use the water heater, don't light it.
Yes. IF you do not intend to use HW, shut off the gas locally IF there is a stop-**** for the HW heater.