My major concern about traveling and carrying homemade baby food is this: there is always a danger of bacterial contamination. Frozen cubes should be thawed at refrigerator temperatures – like with a Thanksgiving turkey – the outer layers may get warm and allow bacteria to grow. So thaw cubes only within a cooler with several blue paks to keep the entire cooler at 40 degrees or less. You don’t want any cube being in any part of the cooler that might be at a higher temperature.
I wouldn’t want to recommend carrying homemade baby food outside the home because I’m really worried about babies getting sick. They have immature immune systems, so it’s best to always be on the safe side. At home you can be sure of temperatures because of the fridge thermometer that I recommend always keeping one in fridge and one in freezer to constantly monitor that temps are safe.
I recommend taking UNOPENED jars and boxes of commercial baby food. Once opened, feed immediately, and discard any leftovers. And the jars/boxes of food you take should have previously been fed to baby at least several days before so that you know she or he is not allergic to the food or has a food intolerance. All foods should be tested for problems several days before leaving. Then use the same brand, the same food. Sprouts is a nice brand because it is not in glass jars that could break. http://www.sproutbabyfood.com/
Unpeeled almost ripe bananas and avocados are good for traveling. Keep them for a few days while they ripen and then feed. Wash their peels on the outside well and store in ziploc freezer bags for the trip. Keep all feeding utensils – bowl spoon etc after cleaning in ziploc bag to keep them clean.
Happy traveling and have a safe and healthy trip!