[not2late]

You can bring fresh veggies. Sweet peppers, radishes, tomatoes, onions, cabbage are among those vegetables that do not require refrigeration and will keep in room temperature. In fact, you can do a portable "root cellar", by putting the veggies into a cooler. Wipe the veggies so that they are dry. Line the cooler with some newspaper to absorb excess moisture and, if necessary, put in a cold pack. But as long as this cooler's temperature remains at room temperature or slightly lower, the veggies should keep. I've done this when I go on work-related conferences out of town and stay in a hotel and the veggies keep nicely.

If you do bring something like lettuce. Don't cut it up. Leave it whole and only remove from the lettuce head what you will be using. Keeping the lettuce intact will keep it fresher longer. In fact, don't bring any cut up veggie unless you plan on eating them the same day. Otherwise they will spoil.