One property had its water heater stolen not once but twice as well as the furnace in the second attempt.

before you go down the rabbit hole to far as @Bruce Lynn mentioned see if the jurisdiction were the lots are located will even allow a surface operation within their zoning code or that lot size.. thats the first thing I would do.Being an old land man I have dealt with a ton of mineral and water rights.. there is a lot to those buggers..

I'm told a permit is required to replace a water heater.

Extensions are likely granted, if needed.You will receive $3k relocation assistance at the end ( unless you have other liens, back due water/sewer/HOA etc. ) You can also stay in the home until the sale closes, which gives you at least a few months payment free to be able to figure out where you will relocate.

I'd only look at land that's at least connected to water and power and already has a septic plan in place.

I guess my other understanding is that I have to provide it is water proof and it is correctly zone for fire.

They almost flooded the entire ceiling the first day because they couldn't even figure out how to turn the water all the way off.I am looking for an answer on how I can deal with this.

(Making judgements based on family status, number of kids, medical animals, etc etc..)4) When you get that first repair call 10pm Saturday night for a leaking roof or water heater do you have a trusted/dependable guy to call and get it fixed that night?

You mentioned the roof and AC being new and i'm assuming they're in good condition.10% should be enough to cover the random water heater that goes or any other lesser headache. 

However, upon finally gaining access to the home it appeared that the water was running from every faucet in the house.