I dont know if you could feed a family with the indoor planters,bet you could grow a LOT.Look at what a few trees can put out.Both indoors and out.A couple full size citrus will meet a family of 6's needs no problem.Same with fruit trees.
Ive seen some outrageous gardens and ponds being put under cover in these homes,very impressive.
Lets try this example....50 feet long with 3 foot wide indoor planters.150 square feet of greenhouse space along front window,and thats assuming only one level,you could do more than one. Using the methods of hydroponic water nutrient (fertilizing) delivery to plants,and square foot intensive gardening techniques,you can cram a lot of food into that space,you can really crowd in the plants. BTDT with my hydroponics experiment,it works.With my hydroponics the plants were crammed to where they are touching each other when grown.
Remember too,while its nice to use your grey water with plants,there is nothing that says you cant use your fresh water too.
This is bananas being grown indoors.People are doing these tropical plantings in snow country,gotta love it.Growing things year round. This concept makes for a very economical greenhouse re: energy consumption.Note how lush that garden is too,stuff is crammed into these planters.You can make some pretty nutritious greywater. Indoor air quality is much improved too,with the plants cleaning the air and pumping oxygen into the house.
"Make it your ambition to lead a quiet life, to mind your own business, and to work with your hands, just as we told you, so that your daily life may win the respect of outsiders and so that you will not be dependent on anybody."