Maybe I should have waited til the lease end date and then deducted the gas usage from his security deposit?

Perhaps make it month to month or pay for the water ourselves and up the rent to cover anticipated water usage for a family.  

I would stick them with the power bill and reduce their rent by the average monthly usage for the past year

When I've dealt with this, I just took an average of the past few years' usage and had the tenants pay it as a fixed amount.

Is the electrical service adequate for most commercial usage, at least 200 amp service with sufficient circuits.

@Avvy Morales  Usually the water company will notice when water usage is constant and high for a period of time and contact the person on the bill. 

I am sure that at least 80% of the water bill is their usage, but they are only paying 60%.My tenants offered to pay more for water this month because the bill was really high.

@David Shiling accurately: by determining the life usage left and dividing that into the cost of the replacement: ie you need a roof in 5 years that will cost you $10k so you need $2k/year of $166/mo set aside.

They seem pretty simple but I’m using those forms for my first property and wasn’t sure if it needs to be more detailed for my specific area or usage?

You have to track that usage, and their is admin involved in that so that would be a negative for most landlords.