I have had two dog pee houses, I take 5 gallons of bleach and mix it with 5 gallons of water and flood the floors.

I think I am qualified to answer this question as I have lived with tenants several times - always with the intentions of just " keeping it on the down low" -  well ... that doesn't work - I cannot keep my mouth shut when the new tenant suddenly redoes the front yard or is letting some guy fill up 5 gallon water bottles in his trunk from the hose  -  or any several number of things I do to improve the property - it is just sort of obvious that I own the place.

If it's a flat fee to paint including materials, it's a flat fee...I don't like to waste time calculating every gallon of paint I might order. 

We do stipulate in our lease that the included water is based off of normal use and usually add an amount of gallons/month we are including based off the number of occupants on the lease, but I'm not sure how hard it would be to get reimbursed for excessive use in the event that happened. 

It comes in 2-gallon cans with plastic lids, similar to those on 5-gallon buckets.

I was hoping to find pre mixed 5 gallons of something other than basic white, but so far haven't had any luck.

I got a 5 gallon container of good quality paint (a nice neutral colour) for $50. 

It took five gallons of urine neutralizer over the coarse of a week to get it smelling normal.

However, it's 500 gallons. 

Glidden speedwall white semigloss for everything...ceilings, walls, trim...47.00 for a 5 gallon at home depot after my discount...i can spray the entire inside of a home for under $150....best decision I ever made, I even use it for all my exterior trim too...lasts just as long as the pricey stuff...