Your son has become used to his feed at night and he is not going to be fooled into drinking water instead of milk.In fact he probably does feel a bit hungry at night so the formula is there to satisfy him. Of course the water will not satisfy him, so that was not good advice. Go back to giving your son one milk feed at night. If he wakes up for a second feed, which hopefully will not occur, you have the choice of either giving in to him which is probably not a good idea or trying the 'controlled crying method [only for the second feed at this stage] This is not easy but will work if you persist with it;read up on Google.
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