Now that the weather has turned cold, I'm tempted every day to buy coffee on my way to school. Now one cup of coffee might not seem like a big deal, but at $1.20 a day, it adds up to $6 a week, or $24 a month! To avoid this budget pitfall, I started making hot tea in my thermos and taking that to school instead of buying coffee every day. I make tea, because I don't have a coffee maker...Yet. Tea is relatively inexpensive and soothing on a cold morning. I drink it during my first class of the day and it fortifies me for my second class.:P
A thermos can be useful in other ways, as well. You could heat up some soup to take to work, or pack some chicken salad for a sandwich. A thermos could also be used to bring a refreshing cold drink to work, or school during the Summer.
I find that a thermos really helps me stay on track as far as going out for lunch, or coffee. I really just can't afford to spend money on those kinds of things, but if I were hungry or cold, it would be only too easy to rationalize making a pit stop at dunkin doughnuts!