Spoons has several location around Fort Collins and is definitely the best vegan option on the CSU campus. They have at least one vegan soup each day and it's usually good. Their website lists ingredients for many items, including the bread (vegan) and salad dressings--check out the ingredients before you go. Soups are typically labeled if they are vegetarian and dairy-free. Currently on campus, $6.25 gets you soup, a salad, bread, and a drink--a pretty good deal.
Cons: Staff isn't very knowledgeable