The cup came with the tomy steam steriliser, but I can't figure it out! /in order to let water out through the 'spout' you have to unscrew it a bit, but then it's really loose and water comes out from round the lid. DD is 5 months and bf but it's soooo hot I want her to have some water (if she wants it), I know bf babies shouldn't need water but it really is hot and she's not happy. I don't really want to give her a bottle, so what do I do?