You have to start learning to conserve water unless you want to fill up regularly. Things like showering, run water till you are wet all over, turn off water, soap yourself then turn the water on to wash soap off. You are no longer connected to mains utilities. You have to consider how much water, electricity, gas, sewage and diesel you are using and how you replenish it. The biggest change is electric, you have to generate all your own power and misunderstanding how to look after and properly recharge batteries is the biggest cause of battery failures, often within months. See the battery charging primer https://www.canalworld.net/forums/index.php?/topic/95003-battery-charging-primer/#comment-2100390