Right up until 1 year, your babies main source of food, nutrition, vitamins etc comes from breast milk or formula. Water is really just an option - for instance on a hot day baby might need some more liquids. We strongly recommend that you do not feed your baby cereal, juice, vegetables or any other food until she is 4 months old. We recommend that you feed this cereal to baby using a bowl and spoon - feeding baby with the spoon. Just use the bottles to feed her the milk.
Fruit juice is much less nutritious than milk or formula.
You should consider fruit juice more of a treat than a necessity. Continue to dilute the juice through the first twelve months. During the first year start by giving apple, pear or white grape juice. I just started feeding my five month old baby stage 1 baby food. Also, I am having trouble getting her to enjoy food.