When I was in the military, they would allow us to paint the government housing, on our own funds, provided that we simply leave a gallon of (Specific brand name) paint that is (specific color) for each room that was painted when they vacated the home.

A load of laundry takes between 7 and 19 gallons of water per load.

In my area about 1.5 cents per gallon.

I thought about hooking the grill up to my propane line (used for the gas fireplace inside) but all it takes is one guest leaving the grill on or a kid playing with the knobs to go through 100 gallons.

Depends on your gallons per minute you get out of the well. 

Utility companies even with no leaks are raising the per gallon usage charges upping the bills substantially.

PM can read monthly and bill back at $0.01 per gallon (which includes admin and sewer impact fee).

I've never owned a heated pool but isn't there a huge lag in temperature changes due to heating/cooling thousands of gallons of water?

We bought the house as 4 bed 2 bath, but the house has a 1,000 gallon septic tank which makes the house zoned as 3 bed 2 bath.

Just buying 5 gallon bucks of paint for full interior paint will cost you a few thousand.