Hi bluebean,
one thing to consider is the limitations on liquids in luggage, any liquids that you do bring must be in bottles no more than 100ml and in a clear plastic resealable bag no more than 1l in size. This includes things like vaseline but not baby wipes.
I have purchased food in the airport and brought it onto US-bound flights, I think it is okay as long as you consume it on the flight, don't know about bringing food from home but I don't think security in Dublin gets too worked up over ham sandwiches. I usually bring snacks but buy them after security for the sake of space in my carry-on. Just to note most airlines publish on their website some details about their in-flight menu. Usually for a flight of that length there will be a meal and a snack. Whatever about food, definitely buy a bottle of water after security, those little glasses they give you are only a mouthful or two.
If you are flying economy you do have a restricted area around you and you can't presume that there will be a free seat next to you so you might find yourself confined to a fairly small space, I usually try to get the aisle as it is easier for bathroom access. Check out
www.seatguru.com for info on the inflight entertainment, seat size and facilities on the plane - you can find the plane you will be flying on from your booking. It also gives you a good idea of seats to avoid because of the noise etc. If it is possible to check in online (I suspect not as you are doing two flights) then it makes it easier to arrange for a good seat. For entertainment I usually bring iPod, book, puzzle magazine and sometimes PSP.
I don't think that Continental provide you with any sort of toiletry bag in economy, I haven't been the recipient of any such luxury and usually bring my own.
Facilities in [broken link removed] I don't really know about. You could try their website though. Just remember you want the facilities in the terminal you are flying out of!