Hi, just switching to toddler milk from normal formula but a bit confused by the instructions. I used to prepare old formula by using boiled water cooled for 30 mins, then quickly cool and store in the fridge until needed. Toddler milk says to use cooled boiled water and serve immediately. 3 questions really, as it says serve now does it mean cold boiled water, if so why is this any different to tap water. Also, can I still prepare in advance and store in the fridge. Thanks.