My daughter and I are currently bottle feeding a one week old kitten. Your kitten is probably around the same age if its eyes are open. A kitten the age of yours should be drinking at least 3 mL about every 4 hours. You should keep stimulating it until its fecal matter begins to solidify and it can go to the bathroom on its own. Our kitten is already doing this, but we still have to stimulate it sometimes. Don't use kitten formula, the formula gives it diarrhea if it isn't diluted properly. Evaporated milk works the best and is cheaper. If it's refusing, just keep trying and feed it every 2-3 hours so it won't get to weak. Check the gums to see if it's anemic (it will have pale gums if it is).