I would think you could bring enough jarred food for some of the trip, that way you know you would have it for some meals. Not sure of the geography involved with your trip, but do you know if they have the same stores by you as they do where you're going? If you know the stores are similar, you can just buy what you need so you don't have to worry about packing it - if you're not sure, I would pack the food. As for bottled water, do you mean in place of formula/breastmilk or in addition to it? Bottled water is fine for water, but I would think at 10 months, he would still need some sort of milk feed.