N.B.
I am not in your situation with traveling with an infant...but if flying, personally, I would hit Target when I get there and get a $25 smoothie machine (thats what I use for my home daycare babies...I make homemade food for infants in my care) and make fresh as you go along.
I never do anything fancy..usually Fridays are what I call "Must go's Fridays" for fruit and I clean out the fruit bowl/refrig fruits that are left from the week with kids (tomorrow I likely will have strawberries, blueberries and pineapple and almost always have bananas to mix these with).
Alot of veggies I just do in small batches...pop some sweet potatoes in the oven...steam some carrots or green beans..then pureee them up.
I imagine travel restrictions and thawing problems would just be MORE of a PITA than making some as you go along for a week of visiting time?
Good luck and have a great trip!!