The health professionals suggest not to feed babies with water because they think that it will make the babies feel too full and won't drink much milk when it's time for feeding. However, my mom (who has six kids) always asks me to feed my bb with some water (half oz) between meals, so I take her advice.
My friends (who have kids) & 99 also suggested me to feed with water in between meals, usually I will feed bb before the meal, since he will not take water after or in the middle of the meal.