BP has various tools to help you analyze your deals (rentals, flips, wholesale, etc). : https://www.biggerpockets.com/investment-calculators7.

We fell in and out of a deal for a single duplex in the spring, but kept searching.

I don't know how the humidifiers are configured, but you might be able to put a small pump into each reservoir (search "automatic bilge pump" on amazon) and move the water into either a larger collection tank (think 55 gallon drum) or drain.

First of all - most people (including real estate investors) are lazy and will always gravitate towards promises of quick returns / passive income promises.But also - what you are describing is something that AirDNA does extremely well and automated - it can be a little pricy, but way way more effective and accurate to do this with that tool - highly recommended

@Kearsten M HiggsTo invest in real estate, set clear goals, focus on education, consider market, lifestyle, and financial goals, and analyze deals using tools like BiggerPockets' Rental Property Calculator.

You can also find real estate investing groups through meetup.com, Facebook, or a Google search.

Most of my screening comes from gumshoing social media, web court searches and following up on references.

And it's cut down my time spent bookkeeping by a huge amount, since I'm no longer searching Quickbooks forums via google for obscure workarounds specific to real estate. 

So, each hole takes you maybe 1-2 seconds to fill and a few more seconds to paint since you already have those tools and materials in your hand to deal with normal wear.

Here are a few suggestions on how you can maximize the wealth of information available: Check out the blogs and podcasts, or take advantage of the search feature (magnifying glass).