DS1 used to drink water & plain milk quite happily. MiL looked after him once or twice a week & gave him squash & 'pink milk' (strawberry milk). DS1 started demanding squash at home & I stood firm but then he got D&V & I was desperate to get fluids into him.
Now he flat out refuses to drink water or plain milk & I have no idea how to break it, bearing in mind he still sees MiL weekly & she will give him squash & flavoured milk (I asked repeatedly for her not to & she just ignored me).
DS1 is a very wilful 3yo & I don't want him dehydrated. I myself don't like water & will actually go thirsty rather than drink it, so how do I tackle this without support from IL or DH?