I had the same issue!! Got there eventually and he now takes some from a nuk perfect match bottle which is not the one we were using before! He was on solids when I went back to work so health visitor just said make sure he eats food and drinks water!
Just keep doing it eventually he’ll realise that’s the only way. Sounds nasty but if he’s hungry he will eventually take it or try a different bottle with a different teet on it