What age can i start giving my bottle fed baby some water in a sippy cup in addition to his formula? and how much can i give him?

Kid will decide: Kids don't need supplemental water but many seem overly focused on giving it. Breast milk or formula have the appropriate balance of liquid(water) to nutrients. Kids growing faster needmore/take more. Many kids will be ready to take slowly from a cup as early as 6-9 mo. A sippy cup with a hard snout is preferred.The ones with a soft snout are basically bottles that look different.