Hello, I'm Dr. Deb and will do my best to help you today.
Thank goodness you found these kittens and are willing to try and help them.
We don't typically treat eye infections with systemic antibiotics since these types of issues tend to be localized ones. We don't need to treat the whole cat, in other words, but just the eyes. Rather, we usually dispense topical antibiotic medications which, unfortunately, are not available over the counter (they require a prescription from a vet who's seen them). I can provide acceptable otc options for you which I'll list below.
However, having said that, if an upper respiratory infection is also present (which is usually viral in nature) and there's evidence of a secondary bacterial infection (there's green or yellowish color to any eye or nasal discharge), then many vets will treat these patients with antibiotics. The primary reason I mention an upper respiratory infection is that it's going to be the most common cause of eye issues if more than one kitten is affected (as in this case).
Cipro can be given to cats but it's more high powered than what I would use for an upper respiratory infection. In addition, there's some evidence that it might cause retinal toxicity so I'd be wary about its use in kittens this young.
I typically dispense Clavamox or possibly Cephalexin for kittens with respiratory infections. But the dose for Cipro would be 10 mgs per pound of body weight once daily.
You do have over the counter options for treating their eyes, though, whether or not an upper respiratory infection is present. These would be safe to use although they don't contain antibiotics.
The Systane products listed below can be used in cats, but the ones with vasoconstrictors, such as naphazoline should be avoided. These products are labeled as "taking the red out" or for "red eye".
Tears Naturale Nighttime
Systane Ultra lubricant sterile eye drops
Advanced Eye Relief Nighttime
Akwa Tears ointment
I would also continue to gently clean the eyes as you have been doing.
If their eye issues worsen or if there's a significant amount of green/yellow discharge and/or they're sneezing, then a vet visit may be prudent.
I hope this helps and that you see improvement soon. Deb