I like to make my own salad dressings to take to work with me to use on my salads to cut back on calories. My dilemma always comes in what to put it in that is easy and portable. In order to recycle, I rinse out an empty plastic disposable water bottle, use a funnel to put my dressing in the bottle and the put the lid on it and take it to work with me. Not only are you helping the environment by reusing those plastic bottles, but the bottle is good to reshake and stir your dressings in as well.
A great way to take a salad to work for lunch is to put all of the ingredients in a reusable glass jar. This page contains mason jar salad ideas.