Looks like your baby will be around 9 months old at the time of your trip? I wouldn't think you would need heated bottles by that age - just use room temperature water in your bottles to make the formula.
Also, I never heated baby food so both of my kids were fine eating straight from the jar. The baby centers in each of the parks have facilities for heating bottles/food but they are not always convenient. Also, by that age, your baby can probably eat a lot of table food so you might not even need to worry about the baby food. I know my youngest child was on straight table food and regular milk by 10 months.