I agree wholeheartedly with Playfelt ... totally normal and almosts ALL infants starting daycare go off their food and drink a bit ... so do not sweat the eating or drinking cause it will only make it 'worse' as he senses your anxiety about it and if you 'jump through hoops' trying to get him to do it even when wee they figure out the power that gives them and IMO that's were 'picky eaters' are born ... offer fluids frequently and food at regular intervals if he chooses 'not to' just let it go with minimal attention or fuss ~ when he is ready and comfortable in the environs he will start drinking/eating for you and my guess is he will just 'make up for it' in evenings with mom and dad in the meantime!