1 year old water help!

My daughter is 13 months she drinks milk now. I offer her a sippy cup of water all day long, its always in reach but she just sips every once in a while. I try to give it to her and she just pushes it away. Ive been doing this since like 6 months. My oldest drinks water like a fish. How do I make sure she’s getting enough water if id let her shed drink milk all day but she only gets a little each time before naps and bed. So how do I get her to drink more water?!? TIA!!