How can I moisten her food???

Hi! Pinchita has been eating her food fine, and everything is normal her poop, pee, excersize and so on...
but her food is a bitt hard.
She is eating a mix of Natural Balance green pea and duck and Royal Canin kitten. Most of it like about 3/4 of it is the natural balance and the rest is Royal Canin. Sometimes she worrys me because she runs so much and I keep thinking she is to thin. She is 350 grams which is healthy for her since she is a tiny girl thats why I feed her the kitten food.
Any way the Natural Balence she loves but when I see her eat it she has some trouble. not much, she still chews it fine but she kind of has to bite a few times until she breaks it.
I checked her teeth today while giving her her poopy feet bath and they are all there, well I can only see the front ones and a few others because she won't let me see the rest :roll:
she still finishes all her food by morning.
Does any one have any suggestions on how to moisten her food just a lil' bit. I try to cut it but it is pretty hard and I am trying to find a better way to help her eat better.
Thank-u !