If you don't have a bottle or syringe to feed a kitten, you can temporarily use a small spoon. When feeding a kitten, approach from the side of their mouth to prevent choking.

How to Feed a Kitten Without a Bottle or Syringe
When you lack a bottle or syringe for feeding a kitten, a very small spoon can be used as an alternative. It's crucial to feed the kitten from the side of their mouth to minimize the risk of aspiration. Feeding directly from the front can easily cause choking. Using a spoon might lead to spills, so it's wise to place a towel under the kitten's chin to keep them dry and prevent them from catching a chill. Always use specialized kitten milk replacer, typically a goat milk formula, designed for feline consumption. Feeding cow's milk or human infant formula can cause diarrhea in kittens.
How to Tell if a Kitten Is Hungry
Kittens under one month old generally need feeding every two to three hours. If a kitten hasn't been fed for an extended period and their stomach appears deflated, they're likely hungry. It's essential to feed them promptly to avoid hypoglycemia, which can be severe and potentially lead to shock or death. If a recently fed kitten continues to meow at you persistently, gently feel their stomach. If it feels round and full, avoid feeding them more, as kittens often don't understand when they are full. The feeding principle for kittens is to offer small, frequent meals that are easily digestible. If a kitten has a deflated stomach but still refuses to eat, they may be ill.