For Enclave, it seems that if we manage and post on Airbnb, our guests cannot use the water park/amenities. 

If the water bill is $100 a month, increase the price by 20% (or whatever you decide is fair) to compensate you for the time required to split and bill and to cover additional use when tenants squander the utility.

Don’t assume that you will have water.

Can fix the water damage in the basement yourself.

Did nobody ever stop and say "oh, hey, maybe we should keep water pumps going because, ya know, no electricity no water pumping, NO WATER". 

@Marc Robinson what's the lot rent, who pays what utilities and what's the source of the water and sewer?

What is the best overall water metering company you have found when it comes to ease of installation, reliability, and the cost of the equipment and monitoring?

It's hard to say offer amount without knowing the rehab part since that could blow this out the water.  

You said public water was available...would the lots require a septic system to be installed or is public sewer available? 

Quote from @James Jefferson: Hi, I have a family member that had a reverse mortgage on their property it's a 3b 1b 1 acre of land heats by oil no hvac and on well water.