Hi Pollyp, welcome to FTS. I'm pretty new also, but you've been given great advice above. I work a job, and have a volunteer music job and church, and teach piano, work weird hours at the paying job (afternoon to wee hours) so sleep days, etc....One thing that helps me a lot is I got a good size ice chest (not large enough to need wheels, but not a tiny one either)....in there goes my foods I take with me from the baggies of veggies like Mouse said, or the frozen meals and make ahead meals TooSweet talked about....in the chest I put in a frozen water bottle or two to keep things cold...and take my food for me for the whole day...and that works for me....I put in a couple of plastic grocery bags so if I get somewhere I for a while I take my food and put it in the bag and stick that in the refrig (at the office for instance). In the chest I put any dish, utensils, etc., that I need, also, so it's all there....even a little salt container in case I eat boiled egg, etc...
also, I do best when I keep things simple, and oh, I learned....watch out for condiments...those carbs in the regular katsup, tartar sauce, etc...can really sneak up.....
best wishes to you on y our FTS journey....