It's a problem for almost every parent. You're out and about with your infant, and there's nowhere to warm up his food come feeding time. Since some of us might feel a little weird about using a convenience store microwave to heat up a bottle of breast milk, it can be extremely difficult to get a temperature-sensitive baby to eat whenever you're not at home. But this isn't a problem if you've got a bottle and baby food warmer in the car.
Car-ready bottle and baby food warmers are easy to use -- just plug them into the auxiliary and go. Most models are designed to fit inside a standard cup holder and can quickly warm up bottles and jars of different sizes. A safety switch prevents overheating, so as long as you remember to pack the kid's bottle, you should be good to go.