More juice for the money

You can usually add a half can more of water (or even a whole one) when you make juice from frozen concentrate without losing flavor. Even whole juice can be stretched with a little water - about a cup or more to a quart for most.

Leftover salad

Got just a few leftover, cut up vegetables? Put them in your blender, add some liquid if needed (tomato sauce, grapefruit juice, etc., whatever is appropriate) and make a cold soup or vegetable drink.

Or cook them (even lettuce!) and puree for soup stock. If you don't want to use it at that moment, you can freeze it for for later.

Free Popsicles

Got leftover "juice" from canned fruit? Mix it with plain yogurt for a flavoring, or freeze it as Popsicles. Or use it as part of the water when you make Jello.