I agree with the members here. Feral cats Can Be Trained!!! All you need is love, time & patience! The 6 kitties, my family presently has, were ferals. Even though they were trapped as kittens, their ages, we guessed to be about 5 to 7 months old at the time. They are all happy indoor cats. Little Heart, Smokey Bear & Cheyenne are 7-1/2 yrs, Cheyenne was skittish of loud noises till about 1-1/2 yrs ago. She now lets us pick her up, brush her, etc. So even though she took longer to train, we never gave up on her. Charlie & Tiger are 3-1/2 yrs & the oldest Romeo, will be 10 yrs next month.
Plus, I have trapped many other adult feral cats over the years, I had them spayed & neutered, socialized them & found them super indoor homes! One of the ferals I trapped & had neutered, an orange male, that I had named Mr Sunshine, because he had the sweetest disposition. He just did not like being in the house. So I bought a dog igloo, with a door, put cushy pet pillows inside, placed it on our back porch, with food, water & a litter box. I cleaned everything every day, just like the indoor kitties. Mr. Sunshine even had an AVID chip & a collar with tags. He was very happy living outside & rewarding us with little "presents"
on the back porch. So, I always thanked him for the presents, & disposed of them by going thru the house to the trash can, on the other side. I went around the house once, & he followed me. So had to cut thru the house, from then on. Sadly, Mr. Sunshine got hit by a car in December. We all miss him, but he lived a happy three years!!
So, Please do not give up on this cat. He or she adopted you as their human angel! Once you trap him or her, get the kitty neutered/spayed. Meanwhile, you can start preparing your house until he is trapped. What I had done, is bought the little safety caps for the outlets, you can buy them in the infant section of stores. If you have house plants, find out which plants are toxic to cats, those I gave to friends without pets. You can buy various cat toys, a cat bed, kitty condo, etc from a Petco or PetsMart or other Pet Store. As for food, I have fed all my cats, even the ferals I placed in homes, a combination of: Dental Diet, Hairball Formula, Urinary Tract Formula & Indoor Cat Formula. And anything I could not think of to help with your new cat, the other members will. Please keep us informed on your new cat!! What are you going to name him or her?