There’s no such thing as a stupid post. I didn’t want to hog the forum, so I held back on responding until somebody else did.
The first place to start in sub-metering utilities is with your state’s laws on it. You should research that on the internet or by calling the appropriate department at the state. You should also contact your state’s manufactured housing association for their input.
Sub-metering a private utility may cause problems. In most states, you cannot bill more for water than you actually pay. You cannot bill the theoretical value of the water that your well produces, so the actually billed amount would be very small – it probably won’t support the cost to install the meters and read and bill them.
But the starting point is the law, and what it allows. After that, it’s simple mathematics.