We're entering hot soup weather!
Easy tip to stretch most soups is to add brown rice. Brown rice also creates a full stomach effect because the fiber expands inside the belly, which means you need less food to feel satisfied. (Be careful if you are a fast eater or you will have a very full effect!)
I even throw brown rice into canned soups. When I have procrastinated on making lunch and the girlie and the husband are hungry NOW, I pull out a can of chunky soup from the pantry and a portion of frozen brown rice from my freezer. (Hm. Did I mention the frozen rice before? It's a great timesaver!)
I thaw the rice for a minute or two in the microwave and then throw it into a saucepan with the soup and warm as usual, stirring occasionally. Throw a nice simple salad on the side (or just some select veggies and a dipping sauce) and it's a tide-over lunch for three!
Now, isn't this kinder on your wallet, your time, and your hiney than picking up something "to go" on the road?