You can't. Boiled water is boiled water, and fruit and juice can't replace water.

Babies need a lot of water every day, and the amount of water fed each time is: 30ml； in the first week of life; 45 ml in the second week; 1 month after 50 ~ 60ml3 and 60 ~ 75ml after 3 months; 70~80 ml at 4 months old; 80~ 100 ml at 6 months; 8~ 12 months, 100~ 120 ml. Water should be properly increased in summer. Drink plenty of water when you have a cold, fever, vomiting or diarrhea.