In a world where everything is done on the run and more and more people complain about their lack of time, starting a new activity seems as a way of social suicide (you will have less time to see your friends and your family). This is why many people are quite reluctant in giving their precious time away on new activities, especially if that new activity is gardening. Yet, what I want to propose you is something simpler, which even though is a way of growing crops, has nothing else to do with gardening. It is called aquaponics and it is the easiest way to have fresh food on your table by starting your own aquaponic farm.
Aquaponics Farm is a system which involves growing fish in normal tanks and using their water, filled with bio-nutrients in a system similar with that promoted by hydroponics. The best thing about aquaponics is that you will not have to take care of the plants, as the fish will offer them enough food to grow and develop properly.
You will just have to take care of your fish, which will also take less time as you will only have to monitor the water and feed them. There is no need to change or clean the water as this is something which your plants will do.