Ben never really drank very much and then we bought him a straw beaker (not to get him to drink more but to get him to fling less liquid around the house
), but the upshot of it was that he started to drink loads - I think just the novelty of it made a difference, and he thought it was pretty cool to drink from a straw
. Also, because it's non spill he has it in the carseat/bath
/can carry it around if he's at a playgroup so he's more likely to drink from it more often. But I think with most of these things, it's pretty random what gets each child to change their habits iyswim?!
He probably is getting enough (it's no fun feeling thirsty so would probably do something about it if he was!) - and perhaps you could try the thing that works with eating i.e. ignoring it, and not offering his cup but just leaving him to it more, and see if it makes any difference.
Is he like it at nursery?
xx