I would check the toilets to be sure that there is no issue with them constantly running water down the drain.  

As an aside we always install those new super flush toilets in the rehabs that we sell......more expensive but it can flush just about anything & trust me they will flush their cat litter & just about anything imaginable.

If a toilet breaks in your house, what do you do?

The gurus usually stress that it's to avoid getting early-morning calls about clogged toilets or some baloney like that.

The key is to have a system in place for everything that could go wrong, (from pilot light going out, to clogged toilets etc.) 

If you flush the toilet, there is as close to "no water" coming out of the shower, as you can get. 4.

My parents (one who is blind, the other who has dementia) are being forced to subsidized a middle age couple who've been squatting in their property since March.

Upon checking I found out that my tenant had a leaking flush tank in one of their toilets which they never told me about.

This is the simplest method, but it also means your tenants are more likely to abuse the utilities by leaving windows open with the heat or A/C running, leaving lights on, ignoring the toilet that constantly flushes on its own, etc.3.

No toilets, no inspections, I can easily manage the property myself, and tons of upside!