Question:
Here are a few threads of discussion from over the years which represent the tip of the iceberg when it comes to the information available to all who read the forums here. Be sure to utilize the forums SEARCH feature as well as ask questions on the forums. You'll never know unless you ask. Knowledge is power and it doesn't hurt to do your homework ahead of time.
Supplies needed for training and in your truck
What to take
Life on the road......Very Expensive!!!! Some more ways to save money
When talking to a recruiter

Answer:
Myself, I stock up on canned goods like Campbell Manhandler soup. I dump the contents into a plastic container, then sneak into a truckstop to use their microwave. I carry bread or flour tortilla to go with my soup. I average $10 in meal cost per day. In the morning, I grab a breakfast sandwich from Mcdonalds and fill up my liter-size mug with coffee B4 leaving the truckstop. When the coffee cools, I pour it into a plastic bottle to sustain my caffeine need for the rest of the day. I also carry a 1,000-watt voltage inverter which I hook up with clamps directly to the battery to power a microwave oven. Its easier to stop at a truckstop to use their microwave; but having my own really helps when I'm stuck for hours waiting to load/unload. I also carry a rice cooker which has a 400-watt power demand. I can plug the inverter onto my dash lighter for this appliance. I pour some rice and water, drive for an hour while the rice is cooking, later pour a can of Vienna sausage to let the rice heat up the meat, then drive some more. I stop later at a rest area to enjoy a hotmeal I've made myself. I keep a notebook to write my food expense and record I've spent $25 to $30 a day in meal expense; which I later give to my tax lady to itemize my travel expense. Thus, I enjoy a large travel expense tax write-off on falsified food expense record. How much canned foods/ dry cereal to carry? Carry enough food for 4 days; this is the worst lay-over scenario you'll likely face. Being stuck in an area with no outbound freight, and dispatch keeps saying "standby, we're still looking for your next load" on, and on, and on.... Carry portable video games or one that hooks up to your TV to entertain yourself for hours.