The best way is to know your ARV and make sure that your purchase price + rehab stays at or under 75%.

To top it off when I told them they need to pay for 1 day they’re staying over they have ignored my messages.

So, think of this model as the financial life a child would receive had the parents stayed together.

In return my tenants treat me and my properties very well, stay longer and refer friends.  

Search public records for foreclosuresShort sale and foreclosure opportunities are typically a matter of public record, and staying current with these records can tip you off to properties that may come up at auction.

If you plan to stay there, ask about the policies regarding owner stays.

By last night and early this morning, I did suggest that they evacuate but that they could stay if they didn't have any other options (surge is my main concern, we are on the 18th floor so I don't think they will have an issue with that and we have Miami/Dade qualified hurricane protection)...BUT, I was very forthright that they would likely be without water and electricity and stuck on the 18th floor possible for some time.  

Try to have 2 families thar would agree to rent it together and stay under a single lease. 

Some will probably stay blighted for a while. 46404 is mostly good.

However, you really only need to have the septic inspected if you are purchasing a mobile that will stay on the property.A septic inspection typically includes a sewer scope, which involves a small camera being fed through the plumbing.