Then there's the community that Chris Dixon mentioned. Soylent may not currently be the best food for everyone (actually, I'm pretty certain it isn't), but it has inspired the DIY community. Personally, I find Aleh's 100%FOOD[1] to be more convenient to use than Soylent, and I've been meaning to try something from axcho's marketplace.[2]

[1] http://www.spacenutrientsstation.com/ [2] http://custombodyfuel.com/