Should I give water?

So my little one is 5 months. At her 4 month apt. her pediatrician said it was okay to start solids. We have dabbled a little but not too much. She is starting to want it more & more & doesn't seem too satisfied until she gets something with a little more substance in her belly. My problem is that sometimes her poops get too dry & hard to pass. She is still being breastfed the majorityof the time & on demand. Should I be giving her a little water with her food too since she is starting to want to eat more?