Some suggestions:

I seriously lack self control so I have found it works best if I take half of an advantage bar with me and leave the rest at home when I can't carry around food that spoils. That way I'm not tempted to eat the entire thing.

Also, celery and cream cheese is okay out of the fridge for quite awhile, cucumbers, cheese sticks(don't get carried away), pepperoni, and porkrinds(just don't bring the entire bag, put some in a smaller one)

I also try to leave food at places I goto frequently, my mom's house I keep stuff there, work, that way I don't get hungry and tempted to eat things I shouldn't. Good Luck!