There is no stupid question. Echoing what Skaling said. The water heater will hold water in it. Though, clarifying; when in use you can certainly turn off the water heater to save on propane and it will not freeze. However, since you are asking this question, let me over simplify things.
When you are going to store the TT (whether over the winter or even for a couple weeks of the summer) it is always a good practice to drain the water heater. Make sure it is turned off and cool. open the access door and you will see the pressure release valve and in a lower corner a nylon looking bolt (around 3/4" or 15/16") (or if your water heater has an Anode rod, it will be a metal bolt), remove that bolt and let the tank drain.
Opening the low point drains will not always drain the water heater.
Since you live in Montana, it is imperative you winterize your TT unless you are storing in inside a climate controlled facility.
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