I am not exactly sure what you are asking on the second part of your question. But we cannot tell if it is blue or cream coloured or tipped unless we can see a picture.
As for your first question about food, kittens should have access to food all day. It is a good idea to feed wet and dry high quality kitten food until at least 6-9 months. Talk to your vet about exact amounts and check out what the can or the back of the bag of food says on feeding instructions.
Kitty is a cute name, I used to have a big Orange Tabby named Kitty. He was a stray we took in and I have no idea whatever happened to him. I wasn't even all that young and I have so many pictures of him.