Please help! Kitten sick and cant go to vet?

I recnently got a 6 week to a month old kitten about a month ago. My sisters co worker found him abadoned and needed a home and my adult cat needed a pal so I took him in. When he got here I noticed he was doing a little bit of sneezing and had a bit of snot coming out. When I questioned the lady who found him she said that the vet said it was a passing cold and that he would be fine. So I let it go. After 2 weeks of seeing the sneezing get more frequent and a little more snot it was recommending that I use the antibiotics that I had remaining from previous kittens who had simulair problems ( recommended by a vet by phone for a small fee) so I did. This did not help. Now Im noticing that the snot is crusting on his nose and making it harder for him to breathe. I CAN NOT AFFORD TO TAKE HIM TO THE VET! Normally i would, i highly care about animals like they are my family. But thanks to state budget cuts my assistance got decreased and left me with barely enough money to pay rent. Can someone please give me something I can do at home or buy for cheap that can help this little guy out??? My heart is breaking there has to be something I can try! And please if your going to be sarcastic or rude just go to another question. I am really asking for advice. And please dont say take him to the vet, its not an option, they wont even talk to me on the phone without charging me 45 dollars i dont have. Thanks to everyone in advance for trying to help!