We feed 90% wet diet, as dry kibble causes bladder stones and kidney failure. MC's grow slower and longer, so I recommend being on kitten food till 2yrs old. I do feed Farmina kitten chicken kibble for days I will be away during the day and can't feed wet. But these are two brands I like and offer a variety. I recommend staying away from tuna and limit other fish. Weruva is an awesome high quality brand & Tiny Tiger & Fancy Feast Kitten are both budget friendly options as well.
Litter
I have used EVERYTHING LOL. I do not recommend pellets, as cats do not like them on their paws and prefer sand. I use Dr. Elseys, it is my favorite! I am also sharing my favorite litter box off of amazon, link below.