I see this is a old thread, but if you don't mind me asking what website do you order from. Love your f1 cat, looks amazing. Here is the kitten that I have. He is only 3 in a half months old.
out of those in my opinion would be Royal Canin and Tiki Cat. I actually use Tiki Cat for wet food but for dry i use Orijen but it is expensive but has high grade food in it.
Start out in the house and once they get used to the harness, then take them to a area where there is no traffic or many people and start very slowly. I have found that rabbitgoo cat leash works very well, just get the appropriate size and sometimes you may need to go up or down in size. Also...
Right now, every time I clean it, they use it again and then I have to clean again. Still in training but hopefully eventually no more litter. The main problem is they like to unroll the toilet paper when they use it.
Honestly I have never used the Tiki Cat sticks but i do use the tuna and mackerel in a can from Tiki Cat, they do offer high Quilty foods. What i use instead as a treat is the Blue Buffalo burst with savory seafood cat treats and my Bengal loves that.
If you do change the food, do it gradually, too quickly will give your kitty bad diarrhea and nobody wants that. If your vet said to use Benedryl, I would use what the vet recommended but if it was me in the same situation. I would look up any side-effects with Benedryl for cats and use my...