This includes attempts to collect, or threats to collect, through a collection agency, by filing an unlawful detainer or other judicial action, withholding any portion of a security deposit, billing or invoicing, reporting to credit bureaus, or by any other means.

Dang, forgot about the inspection stuff.

I would then just tack the water bill onto their rent invoice. 

I am interested in low to no fee payment methods, and a plus would be a method that can send invoices as well.

You can setup each tenant as a customer and setup memorized transactions to create and email an invoice to each tenant on the first.

Dang! 

@Ryan Steiner You may be overthinking this a bit; start by just asking for an invoice to the point of termination. 

Security Deposit: Documentation, invoicing, deductions, timelines, penalties, etc. 

Originally posted by @Michael Dang:@Wei Cui I suggest picking up the phone and call some developers.

Where's that dang correction?