Good idea Medsen!
Here's something on the subject from Jack Keller's site, I've never tried making it but you might find it useful:
There are numerous authorities that cite different ingredients and proportions. Proprietary yeast nutrients usually contain DAP (diammonium phosphate), which supplies nitrogen and phosphorus; urea, which supplies nitrogen; citric (and perhaps other) acid; trace amounts of biotin; and yeast hulls. The formulations of these nutrients are not generally public knowledge.
Less secret are the formulations of yesteryear. Pre-World War II recipes used malt extract and lemon juice as nutrient, while many post-war recipes used to use ammonium sulphate, magnesium sulphate, potassium phosphate, and citric acid for yeast nutrient. Both, I am told, worked well enough, but not as well as today's formulations. I would suspect that it would be easier to order a packaged nutrient from an out-of-country supplier and pay shipping than to find DAP and the other constituents locally and experiment with proportions. Still, a chemist (druggist) might be able to mix the following nutrient for you without problem:
ammonium sulphate...........130 grains
magnesium sulphate........... 20 grains
potassium phosphate.......... 70 grains
citric acid ...........................260 grains
This makes an ounce of nutrient, enough to make four gallons of non-grape wine or two gallons of mead. While not as good as commercial formulations, it still should work well enough. The absolute against-the-wall substitute is malt extract and citric acid (lemon juice) mixed half-and-half
Hope that helps. Regards, GF.
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