DS1 is a terrible drinker - we're trying to potty train at present and really need to get liquids into him. It's hard going to get him to drink 2 x 300ml cups of water a day - and Dr has said he should be having 3-4 of them cos of consitipation issues. Any ideas? Have tried bribes ... one smartie for every cup finished. Doesn't work. He's 3.5 BTW. Thanks!