It’s normally an older person who has inherited the house and can’t financially handle the maintenance and repairs and usually tax-delinquent.

Only for a measly $1200 of potential income a yr, you will be spending over $10,000 (Vacancy + Repairs + PM/Realtor expense).

After that you need to make sure that your rehab numbers do not exceed the ARV (after repair value). 

I asked him to move his camper so I could repair the sprinkler. 

What other issues can I expect when a septic fails or the foundation needs repair?

I  am taking uber while its being repaired.  

If you were to find things wrong in the inspection due to these factors that would cost a lot to repair, the seller may be willing to go down on the price.

You'll find a few good ones who are very good at consistently bringing good deals that fit your criteria, and a lot more who just have overpriced crap with inflated ARVs and low repair estimates. 

You will also need to account for after move repairs.

I have read that when HUD sells a home in need of repairs they will require those repairs be done within 6 months, or they want a certain amount put in escrow to go towards these repairs, if I recall correctly.