<human>: Can you give me a shortened version of the text?

I just took on the responsibility of raising an abandoned kitten my dad found outside his home, as I have a lot of previous experience raising and bottle-feeding newborns.  The kitten was, according to him, abandoned for a few days before I got him.  This is the third day I've had him, and he seems mostly healthy from what I can tell, except for his constipation.  His stools are abnormally hard for a kitten and he is in obvious pain when he strains to get them out.  The process of helping him defecate takes forever.  I've already reformulated what I'm feeding him to have more water in it, as per what I've found through research of other cat fosterers, but that doesn't help the fact that he's in pain right now. Is there anything I can do to help him pass his stool easier?  I'm very worried about him.
<bot>: less-than-week-old kitten has hard, painful stools, how can I help aside from watering down formula?