All of the systems and materials in your vehicle are designed to be stored at low temperatures. If you don't plan to use your van in the winter time then you can choose one of the winter storage options.
If the temperature in your area does not drop below 0 degrees for longer than 1 day, then you can store the vehicle without draining the water system. Just get rid of the pressure in the water system. You do this by turning off the pump on the main dashboard next to the shower by putting the toggle switch signed PUMP down and opening the faucet in the kitchen and shower. Gradually the water will come out of the pipes and the pressure will leave the system.
Also, turn off all consumers by lowering the 2 circuit breaker in the electrical box in the luggage compartment.
Remember to empty and wash your refrigerator and leave it ajar, for example by putting something under the lid of the refrigerator.
In the shower, clean the tray and leave the door open.
If it's sunny enough in your area, you can leave the battery in storage for extended periods of time and it will recharge all the time. In any case, check the condition of the battery every 2 weeks. If its charge is dropping steadily, then connect the car to an external power supply.
If there are long frosts in your area, it is necessary to drain the water system. To do this, do all the requirements from the first option, and open the water tank drain tap, pre-positioning the car on a sloping surface so that the front is higher than the rear. Also drain the water heater by opening the appropriate tap, which is located on the left side of the luggage compartment.
If the frost in the storage area is constant, there is little sunshine and no way to connect the car to 220 volts, you must remove the battery and take it for storage in the heat. To do this, lower the main switch in the dashboard, lift the battery protection, unscrew the latches, disconnect the battery breaker, disconnect the terminals and remove the battery. At home, store the battery in a warm place in a fully charged condition.