Google isn't answering the questions I have.. She is on Pro Advance Similac powder and shes 3 weeks old. What I've been doing is boiling water (tap water and baby jug water), letting it cool for 10 mins, then pouring 20 oz of the water in a pitcher and mixing in 1 scoop per every 2 ounces (while it's still hot). Then I put in the fridge til I need to make her bottles. It's used within 24 hours. I probably should be asking her Pediatrician this question but she doesn't go back for a while and I wanna know NOW if I'm doing it correctly or not.