Assuming you would like an answer to the question of how water gets to the toilet in an RV:
Water enters an RV through a fresh water connection. This is typically a hose that is connected to the main water supply, such as at a campsite spigot or your home’s water faucet. The water then goes into what is called the freshwater tank.
From there, it is either pumped by an electric pump or a manual hand pump (found on older RVs) through pipes and hoses to different fixtures in the RV, including the toilet. A gallon of water weighs about 8.3 pounds, so imagine pumping quite a few of those up into the air and then keeping them moving through small pipes! That’s why it’s important to have strong pumps and properly maintained hoses and pipes.