Jack misses a meal once in a while so I wouldn't worry about it. That being said, yes, water is important. You might try chicken breast and rice or scrambled egg. That's what I give Jack if he doesn't want his regular food, then he will will get back to his regular meals. I also often mix sardines in water with his kibble and green beans for something tastier, and to help with his coat. He loves his sardines! I guess they have off days like we do as far as eating. If she doesn't eat anything after a couple of days, then you need to worry. If she doesn't drink a lot, try fat free, low sodium chicken broth. Keep us posted! Free feeding isn't a good idea, for many reasons.
Hoomom who was blessed with Jack. RIP Sweet Cynda 6/3/10, loving Lexie 9/13/13 and Jack, 3/22/16.