1) Keep a bag of mixed chopped veggies in the fridge. Carrots, bell peppers, mushrooms, zucchini, onion, peas--just about anything will work. This will save time when you're in a hurry and the mix can be used for so many things, such as a quick curry or stir-fry.
2) Make extra rice to keep in the fridge. That way when you cook your pre-cut veggies you can serve them over pre-made rice for a cheap, quick, and easy meal! Just make sure the rice is covered tight so that it doesn't start to dry out.
3) Buy pre-chopped garlic. Almost every savory vegan recipe I have even made calls for chopped garlic. Instead of going through the hassle of doing that every time, buy a jar of garlic and just ladle in a tablespoon for each clove called for. Save the whole garlic and chopping it by hand for your better recipes that really deserve it.
4) Don't wash or peel things you don't need to. I don't peel carrots and I don't wash bagged lettuce. Unless you can see bugs or dirt, what is sprinkling a bit of water on it going to do? Absolutely nothing. If you are buying non-organic fruit you may want to rinse off any residual pesticides or other nastiness, however.
5) Don't bother to refrigerate packed lunches. In almost every recipe that I have made to take to school with me for lunch, there is nothing in them that would spoil from being left out at room temperature for a while. So instead of fussing with a insulated bag and a cold pack, I just toss a tupperware container and a fork into my backpack. This also means that you don't have to find a microwave to reheat cold food.
Btw guys, today marks the one month mark for my vegan challenge. I've lost 10 lbs so far and am still dropping fast! Why on Earth didn't I ever do this before now...?