It's pretty much what I said, tbh. More bad science. Apparently if we are not 'hydrated' our brains don't work so our school will fall down the league tables. I think there may be something on our staff room wall about it. Not league tables, having to drink an ocean of water a day. We do need a set quantity of liquid each day, but it doesn't have to come out of a plastic bottle with a designer label. Guess what - our food contains water, and that counts as liquid. What doesn't count is bottles of revoltingly coloured fizzy liquid. I don't allow water in lessons. No-one's brain is going to give in in the max. 2 hours between breaks.