Staying hydrated?

I am not sure if Kaitlyn's getting enough liquids in her diet. Yesterday for example, she had a breastfeed at 7:30am. Then between 7:30am and 5pm, she only had 150mls of expressed breastmilk!!! She had 70mls of rice cereals as well, but 150mls of milk just seems so little. I also tried to give her water, but she just plays with her sippy cup and doesn't have more than 10mls the WHOLE day. At night, she had another 120mls of milk and 100mls of cereal... I am not sure how to get her to drink more? Her nappies are not as wet/heavy as before...