Two feral kittens, help?

This is the third day since I spotted the two kitten. We have a fenced in backyard and I suppose they were small enough to slink through the links. There are a lot of stray dogs in the neighborhood, as well, and I think they got in to be safer. On the first day, I was worried they may not even make it. They were very sluggish and they look very beat up. I fed them some rotisserie chicken the first day, because it was all I had on hand (I don't own any pets) and then I bought some Purina kitten chow the next morning. They've been eating well and today they were running and playing, where as the first two they mostly lay still in the bushes. They're still very scared and will run away if I go outside, but they seem to be getting less timid. They're quite small, I'd estimate 6-8 weeks old. The first night they were still squeaking for their mother, but she's never appeared. I think maybe something happened to her. I don't think she was ever in our yard. It wouldn't be easy for her to hide and I've never seen an adult cat in our yard. The neighbors feed an older, spayed female that chases away most cats, but she will sometimes let stray/feral kittens pass through the area and wont hurt them. She doesn't come in our yard either, though. 

My biggest concern with these kittens is that they have a large amount of missing fur patches. The patches are evenly distributed all over. One has a lot missing on it's back legs and one has a pretty sizeable missing patch on it's stomach and back. They have patches on their ears, tail, back and near the nose, also. I first thought they might be injuries, but since they've gotten closer I'm more inclined to think it's a dermatitis type issue. There isn't much bleeding at the sites, if at all. I can tell they're pinkish, but they've still only gotten within several feet of me, so I can't give a detailed description of the patches. They pick at their fur and scratch almost constantly. I haven't noticed them scratching the spots more than just randomly all over, so I assume it's fleas. I've looked online and it seems the likely options would be flea allergy dermatitis, mange, ringworm, or possibly a solar allergy, since they're white kittens. Is there any way to tell besides taking them to the vet? I would love to take them, but I just can't afford it. I also rent a room here and, while feeding them outside is acceptable, I can't bring them inside. Right now they wont let me touch them, but I would like to treat them for fleas if they calm down some. I'm willing to try anything over the counter if I can get it for under $50-75, but I think anything too intrusive will just scare them off from me and I wouldn't be able to continue treating them. 

I live in a fairly undeveloped part of the midwest and there aren't many help options. If I take them to a shelter, I know they will be put down. There aren't really any rescues in the area to turn to. We have a huge population of stray animals, cats and dogs, and many animals with homes are even allowed to roam the area freely. What are basically my options here? What can I do to help them?

If you can borrow a humane trap and trap them, it will help you assess their condition.

Make your plans first, though.  From your description, they may have ringworm, so they will need vet attention soon.  See if you can contact a rescue for guidance and help.  If you can't get help, you will have to take them to the vet yourself.  Contact vets and explain the situation - see if they can help.

Once they are trapped, you will need a separate room for them.  First, in case they have something contagious, they need to be quarantined in an easily cleanable space.  Second, they will need to be confined in a space where they can feel safe.  Just being brought inside will be a big change for them, so they will need to adjust.

Finally, you will have to decide what's going to happen to them.  You have some choices - you can TNR - vet them, get them fixed and their shots, then let them back out into your yard and continue feeding them.  You will need to provide them with shelter as well.  Or you can adopt them as house cats - either keep them yourself or find another home for them.

All of this will take some planning and money.  It will be a challenge but it is well worth doing!