Do you have a breakroom? At my last job, we had lockers and there was also a fridge and microwave in there. I could take any type of lunch and/or snacks I needed and keep them there and just spend my breaks and lunches. It takes some discipline but that was the only way I could stay on track.
If you don't have a breakroom where you can keep food, then you'll just have to find something close to your job that is reliable that you can continuously go to eat. Food at your job that you can get or another resturant close by...
I hope this helps you! I know I didn't really tell you much!