We are also thinking of bringing our then 13 month old to Spain in Oct 2013 and I have the exact feeding and drinking questions in mind. Plus logistics questions like how we are going to port our then very mobile toddler around!
1. My guess is that by then, they will start to consume more solid food (apart from porridge). I already start to give my boy mashed macaroni and table food like mac and cheese, bread, grilled salmon.
It will be good to start her on some jar food like Heinz because these can be eaten straight off the jar, with or without heating. If you want it warm, just dip it in a hot water bath - very easy food to bring around while travelling.
4. As for water, I would be boiling my own in the hotel/apartment and bringing a thermos out just in case we dont't get hot water when we want. I guess you should be able to get refills from most restaurants.