My first suggestion would be to make a big salad to last a few days and have it stored in an air-tight container in the refrigerator. Make sure you don't put anything in it that will cause it to wilt or spoil. We put lettuce, celery, bell pepper, sweet onion, and grated carrots in ours. Then when it is time for dinner we just add whatever else we want in it, avocado, tomato, etc. The other thing we do is keep a bag of pre-washed spinach in the refrigerator. It makes a quick add to a salad, or in a pinch, a salad by itself, or to make Burrito Roll-Ups.
Burrito Roll-Ups are:
a whole grain tortilla
finely grated carrots
green onions and salsa.
(Mashed avocado can also be spread on the tortilla before adding vegetables.)
I know it sounds kind of weird, but it is actually very good and fixes up quickly if you have the spinach already pre-packaged and washed. ENJOY!