After using your motorhome appliances for a while, you have to check your gas bottle. If you use the shower and oven every time you have to check it more often. Especially in winter with the central hot air heater going, you have to do this every week otherwise every second week should be enough. Gas stations can fill them up for you. NO self-service! There also heaps of places you can swap a bottle.
After a few days using fresh water, you need to refill the fresh water tank. It’s easy and won’t take much time. This video shows you how to do it