You don't have to follow their exact quantity, I just cut in half (1/2 scoop instead of 1 scoop) and add more water, so can last for a long time.
Btw, I got too many cans when i was at the 雅培 seminar as they had discount, and I don't think I can finish them all, so anyone wants 雅培奶粉 (800g) for HK$90/can? Can pm me ar ...