stevie, whatever she will take, i offer DD water in a sippy cup between each bottle, sometimes she will have 100ml sometimes none...i wouldnt really stress about it, if shes thirsty you will know!! but i like offering DD it in a sippy cup instead of bottle caus then she knows its not 'mlik' time kwim?

heva, boiled water upto 1 yr old....also maybe try 10 or 20ml of prune juice in the water makes it nice and sweet (but may give ur DS the runs, my DD has constipation so it helps)
HTH girls