Baby drinks how many bottle of milk in IFC

Hi mummies, just curious, those that send their baby to IFC when they baby is around 3 months, and theyre on formula milk, if you send them full day, how many bottles of milk do they drink in a day in IFC? And every how many hrs? Somehow my baby most of the time can survive 2hr 50 mins or 3hrs 120ml at home however at school he’s drinking like every 2 1/2hrs, which is like 4 bottles. And im worried if suddenly theres not enough bottle & formula powder in his bag for that day. Is it normal to bring 4-5 bottles & formula dispenser?