If I were to purchase a rental property that my daughter would live in, could I "charge" rent and pay myself (or LLC) with tax free money from the 529 plan?  

Add a cast iron or aluminum fence around the pool for safety and charge rent high enough to include a pool company to maintain...maybe, I do not have a rental with a pool (above is our pool) but I could see it being quite a plus if safe and easy for tenants.

We are wanting to buy homes and multifamily charge rent and use that as income for ministry purposes and also to house missionaries and people in need for and from the church.

I also heard/saw a suggestion here that the owner chargers for cigarette butts they find on the ground.

.$100/mo included in Rent will scare off the Tenants - you can't charge rent more than market Rent is...but you can bill them water/sewer if there are meters for each unit

Now if you are not able to secure a new tenant until after the current lease starts you may be able to charge rent until a new lease starts. 

This house is the only 5 bedroom in the immediate area, so should I expect to charge rent at the high end of the spectrum?

So it's possible that without a heating source the home isn't considered legally habitable and you could be required to not charge rent for those days. 

Dbda.just charge rent weekly...  

You should not charge rent based on tenant count, it is discriminatory.