When Do You Stop Bottle Feeding A Kitten?

I am a stay at home mom and my BF is currently deployed so I have 2 kittens. One of the cats we bottle feed but we still use a syringe to get her food in her mouth since she’s not old enough yet to eat solid food on her own. We also give an eye drop twice daily. Since he’s gone, I’ve been using my kitchen sink with warm water as opposed to buying all those bottles for them…for now! But they are getting hungry more frequently than before so that time will come soon, hopefully soon!

Anyways, does anyone know when you stop giving an eye drop or just start feeding kitten?