we took snacks in our back pack the week before christmas and had no issues...Heck security didnt even look in our bag....they just ran the little rod in and that was about it....
When I called to make a reservation for our club level room (just a little over a week ago), the phone reservationist rattled off a list of perks for staying club level. One of the things she mentioned was that you could get bottled water in the club lounge "to take with you into the parks" .