lamahomebird, if you are serious about buying a rural property the first thing you need to do is stop asking questions here and get yourself a decent lawyer, who specialises in rural properties and not one suggested by the owners or any sales agent, which will cost you money
Next you start with the deeds, is the property on the land the same as what os on the deeds, is the land registered,is the property LEGAL, i have seen deeds where they say that there is a 2 bed property of 59 sq mts on and actually a 4 bed had been built, this property would be ilegal
Next I spoke to a client I had in Torrremendo in a similar situation and Iberdrolla wanted, subject site survey they quoted €30 euro per metre plus €400 for the meter
Before any company will connect they need 2 things the first is the bulletin, this is a document produced by an licenced electrician that shows the installation meets the required standards to the connected to mains electricity. The next document is a certificate of habitation, agian no COH no connection
The only way to check the water is to employ a surveyor, again more money who can get the water tested and look at the deposit
Based howvever on the information that you have provided I would stay well away from this type of property unless you have the assistance of a good professional