My DIY blend uses oat flour. There are a lot of soylent recipes out there - the hacker school soylent recipe [1] is a nice oat-flour based one with a decent default nutritional profile.
edit: also note, the only synthesised 'chemicals' most recipes include are potassium gluconate and calcium citrate. Everything else is a food or food extract.
1: http://www.cookingfor20.com/2013/06/18/hacker-school-soylent...
edit: also note, the only synthesised 'chemicals' most recipes include are potassium gluconate and calcium citrate. Everything else is a food or food extract.