My neighbor thinks I'm nuts, but I planted corn, beans, and 3 different kinds of squash together (It's an old native American trick) the beans feed the corn, the squash shades the roots, and the corn acts as a trellis for the beans. (you get 3 times the crop in the same space) - I had some nitrogen troubles, and it takes a little bit more water because of the "crowding".
I still had to add more nitrogen cuz the soil isn't built up yet, but it's getting there.

best of luck with however you decide to go about it.