So Digi and Chipper (about 8 wks) are scarfin' down the esbilac. I know its better very warm, so I heat it by setting a smaller container of formula in a cup of hot water til warm. But, while they are eating, both the water and the formula cool down. By the time we're near the end of feeding, the food's almost cool. That's probably not good. What do other's do??