There are many weeks where I have to scramble to make something before work because I didn't plan my meals. I try to limit the food I eat at work, because I never know if I can eat anything besides a salad. It is always a gamble. So, I have made a point of being more planned. This is not only good for the gluten-free individual but for also for weight loss since you are more likely to have yummy meal ideas and stick with your diet.
The Blog Uncluttered has a good meal plan template.