There are many different kinds of hydroponic systems. Some are more complex (i.e. nutrient film technique), and some require an electric pump. But in my opinion, there are forms of hydroponics that are perfectly suited to an aftertime environment. For example, electricity is not needed if you are using a simple ebb and flow model. In that case, a bucket would be raised and lowered to flood and drain the tanks (respectively). Take a look at the 4th Picture and on the Simple Systems page to get an idea of what I'm talking about. Hydroponics pro's as compared to soil based: better yields, faster growth, less chance of disease, and more plants in less square feet.
Offered by Gabe.
Personally, I will be using soil based food production. It is suggested, and some of the evidence agrees, that hydroponics can out-produce conventional soil-based crops, however, there is the need of a carefully controlled nutrient solution and more electrical needs in the form of a pump to circulate that solution. The Troubled Times hydroponics lab has proven that alternate forms of nutrient solution can be used, but not everyone will be able to advance purchase their hydroponics equipment and then be able to maintain it after the shift. One can always fill a bucket with dirt and stick a potato in it and put it under some light.
Offered by Roger.
Good points on hydroponics. Often what we think of for hydroponics involves elaborate plumbing, with pumps, pH meters etc. But as you pointed out they can be simple, like an ebb and flow method or even a wick system which simply requires one to keep a reservoir full. One other comment involving my experience is that the greens seem the easiest and fastest growing in hydroponics, fruiting plants (tomatoes, peppers) require a broader range of nutrients, but if you do it right you can have incredible yields.
Offered by Stan.