Can anyone help? Ds has Spina Bifida, and he seems to be on drinking strike at the moment. We catheterise twice a day, so urine infections are a constant source of concern (fingers crossed, none so far), and he can get constipated when he hasn't drunk much. He's up at the moment with stomach ache, and I know it's because he hasn't drunk enough. So how much should he be drinking? I know it's 2 litres for an adult, but he's quite a bit smaller than me!