I NEED SUGGESTIONS!!

I am a restaurant manager. I just left a job where I worked the overnight shift and I had the hardest time organizing and sticking with a food routine that helped my weight loss goals. I ended up gaining 20 lbs there, and I didn't even like the food! Now, I am in a training program at another restaurant where I actually DO like the food! Our schedule is grueling and there is no time for little snacks or even anywhere I can keep a bottle of water during my shifts. We do get lunch, but it's after 6 hours of work (2 days a week we work for 14 hours), so my best intentions turn to crap once I sit down to eat. I'm starving and I want as much food as I can get! I also can't bring my own food to work, because they want us to get acquainted with the menu as a part of the training. Everyone around there jokes that I will DEFINITELY gain more weight working here, but I can't afford to do that! Please help!