in some markets I build in we have to sprinkler the homes because fire flow at the hydrants is not adequate.. in our area you need 1500 gallons per minute at the hydrant sometimes they will over look other areas nope and that will add 6 to 10k per home. 

Sewage had backed up and caused gallons of "**** water" to come up from the toilet.

I will look up gas prices on airplane websites that tell you were the best deals are on gas along your route of flight.. this can save a bunch. instead of popping into say Sun valley and paying 8 bucks a gallon X 60  to fill up i can hit Idaho falls small non towered self serve and get gas for under 5 bucks so save 200 dollars right there. 

2) go and purchase several five gallon water containers and leave them by the outside door(s) for the tenant?

When someone buys 2000 gallons at a shot and has a check in hand he will discount rather well .

The lease reads: "Services: Water, Electricity, Heating Oil (up to 1,100 gallons), internet."

Some of my immigrant tenants keep 5 gallon buckets in the bathroom I think they wash their feet in it or maybe their hind ends .

When we bought the house we are living in there was a 2,000 gallon fuel oil tank buried in the front of the house.It had been disconnected from the furnace when the furnace was switched over to propane, but tank was never removed.We found out from the state environmental agency that the tank needed to be inspected before anything could be done.

They currently have 30 gallon low boy electric tank heaters located in the kitchen. 

I don’t see the value to you and this comes from not only an investor, but also a GC.Padding costs, ordering 5 gallons of paint rather than just the needed for and using 5th gallon for another jobsite, inflating labor costs, etc are all risks you will be taking in such an arrangement and many of them are difficult to catch.