S.H.
he may be self-weaning... that is kind of what my son did, and he self-weaned at about 1 year old.
But yes, check with your Pediatrician.
And after 1 year old... a baby/toddler can transition to whole milk. Whole milk because the milk "fats" in it are essential for brain development and growth. So you can ask about that too.
Sometimes bottle strikes are also due to teething.
Or, they are simply too full to drink from a bottle or to nurse, because they are given solid foods first. Not after.
In my case, our Pediatrician advised to give their nursing/bottle BEFORE solids, for example.
But each Doctor varies.
Your son seems like a good eater, which is good, and he likes water.
Just make sure how much water/milk he should get getting at his age... how many ounces, and in relation to nutrients. I have heard some say that too much water can leach vitamins... but then again, water is a "nutrient" as well. So I don't know.
Did he stop taking bottles at daycare because he is not offered it (his milk), or because he just does not want it?
Each baby/child weans differently.
All the best,
Susan