No, don’t use the canned veggie liquid to soak beans. You don’t want to waste those vitamins. Use the veggie liquid in cooking or in soups. Whenever I have room in the freezer, I keep a large container to dump that liquid into and use it in the winter as veggie stock for soup.
The reason to soak beans is to get rid of the dirt and to cut down on cooking times. Both things you want to do in hards times. Use potable water to soak them but afterward, it’s no longer potable so use it for watering the garden or something else.
http://missvickie.com/howto/beans/howtosoak.html
Thanks for information on re-use of veggie water and soaking beans