Beyond the kitten milk at Petsmart or another petshop, if you can't find the bottles use an eye dropper.
If you can't get kitten milk, you can try to get him to eat small amounts of wet kitten food or dry kitten food soaked in warm milk.
However at two weeks, he is probably not developed enough for this.
Keep him warm and dry. Kittens that young can't always maintain body heat and need to be some place warm.
However, other issues. When kittens and puppies are very very small the mother licks them to stimulate them to poo.
If your kitten does not have a bowel movement several hours after feeding, you may need to use a warm wash cloth and 'lick' it across the anus.
The stimulation will trigger him to evaucate.
Your kitten may be old enough not to need this help. If he goes on his own, then you are fine.