mixing neosure 24 calorie on the go?

the nutrition department with our nicu gave us instructions for mixing 24 cal Neosure at home but the amount is 4 scoops to every 7 oz of water.... it ends up making roughly 8 oz... my little guy is taking 2 oz per feed and gets the neosure 3 times a day. so that mixture is typically fine.... but I hate that I have to keep it cold after it's made and warm it before feeding.... I'm wondering if anyone knows how to mix it to make 2 oz at a time?.... so I can just take the powder with me and add warm water? the instructions on the can are for 22 cal... not 24....