question on formula...

I was giving my daughter similac sensitive, but I recently got approved for WIC and they don't cover similac. They cover enfamil gentlease, which is about everything the same. Buuuut the scoops and ounces of water are different. My girl eats 6 ounces and with the similac it was 3 scoops for 6 ounces. But with this enfamil, it goes 2 ounces, 4 ounces, & 8 ounces. It skips 6 ounces. So does anyone know what I should do or how I can make a 6 ounce bottle with this formula?