Tommee tipper sippy cups are great as they can help themselves. I also add vitamin drops to my babies water and I think he thinks it’s juice. On the NHS website I think it says babies should have 400ml of milk a day but that’s more in relation to vitamins x
Having the same problem and have the tommee tippee sippy cups too which she'll have a sip here and there throughout the day. We are on 3 - 4 bottles of 5oz 150mls milk a day. I also add her formula into her breakfast weetabix to get some milk in too.
My boy doesn’t like drinking water either, we just use a sippy cup and get him to take sips every so often so we know he’s still getting fluid in! He’s currently on 3 bottles a day (some days more if poorly)