Does anyone else struggle to get their toddler to drink?

He still loves his milk so he has a small cup with breakfast and before bed but getting him to drink water/squash is hard work. Some days he does drink a good amount but the majority of days it’s a struggle and I have to keep passing him his bottle every 15 mins and he just pushes it away and says no. I’ve tried to give different bottles to mix it up a bit. When we are out and he is running around all day I have to get him a fruit shoot just to get him to drink something. Yesterday he probably had about 6oz of squash the whole day and we was out all day and he was doing a lot of walking 😑 anyone experiencing the same or have any tips? Thank you