I think he is going to get one if he wants too regardless! I use juice to stop him getting constipated. Hipps/boots do flavoured mineral waters - but you can make your own cheaper!
Iv got that cup hun...isnt the flow too fast for a little bubs?? Also i think im going through a blond moment but how do you give it him in that cup? Do you lay him down as though you are giving milk??
i got one free with my steriliser...