Re: water
Think of drinks he does like and just water them down. If you give him Orange Juice for example mix it with 1/3 - 1/2 water. I often do this with my own Juices as I don't like overly sweet things but I do like a bit of flavour. You can also do it with Milk, if you give your son a lot of milk.
Thinking of ways you can add extra water to his diet is important, Try feeding him foods that have a high content of water such as watermelon (Seeds removed), Grapes, Oranges, ETC these will also hydrate him if you are worried of Dehydration, they are also a healthier alternative to Cordials or Juices. 
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