When we travelled earlier this year, my younger son would not take jar food after being fed from home made baby food since he was introduced to solids, so I would recommend that you start mixing some jar food now into his food, so that he gets introduced to the taste. Also bring along some rice cereal, which you can alway mix with apple or pear puree, if you get really desperate. I was completely not prepared for my son to reject his bottle food, but in the end, he was willing to accept any brand, as long as I doctored it up a bit with rice cereal and one or two "fresh" ingredients.