Brain, many formulas come in different strengths. You might luck out and be able to get yours in a higher caloric density so you need less to meet your daily goals. Check with your nutritionist or whoever helps you with the prescription formula. With the higher calorie formula usually being a little thicker, you might need to add a little more water. Even with the extra water it still should be alot less you have to feed daily.

Sounds like you are doing great so far! Keep up the good work