EBF 15 month old DS has never really taken to drinking anything other than his mother's milk! He eats reasonably well, but only ever takes tiny sips of water (often with a bit of a cough and splutter) from his cup. We've tried a whole range of cups including doidy, straw etc. I do worry that he isn't getting enough fluid in, especially as I would like to be able to leave him for the day/night on occasion. Is the only way to reconcile this situation to stop breastfeeding? Does anyone have any tips?