For a short period, you can try these alternatives, but they are not ideal and should only be temporary:
* Goat's milk: Dilute goat's milk with water (1:1 ratio) to make it easier for the kitten to digest.
* Kitten milk replacer: While you can't get to a store, you might find some at a nearby veterinarian's office or animal shelter.
* Esbilac: This is a commercially available milk replacer for puppies that can be used in emergencies for kittens.
* Formula for human infants: Use only if absolutely necessary and only for a short time as it is not ideal for kittens. Choose a formula with low iron content and dilute it with water (1:1 ratio).
Important notes:
* Do not give cow's milk to kittens. It can cause digestive issues and is not nutritionally suitable.
* Feed the kitten small amounts frequently. Young kittens need to be fed every 2-3 hours.
* Keep the kitten warm. They lose heat easily, so use a heating pad or a warm towel.
Again, it's crucial to seek professional help as soon as possible. A veterinarian or animal shelter can provide the proper care for a young, orphaned kitten.