[DIYbio] Using dietary amino acid supplements in media

For a high school project (meaning I really need to keep this cheap as possible) I'm making a media to place tissue silk glands and spinners from spiders. I'm experimenting to find what media produces the most amount of silk. One of my proposed media is just a simple ringer solution, but with added amino acids that the gland uses up rapidly such as valine, methionine, threonine etc. In order to put only these solutions into the media (at the rate they are present in the hemolymph of course) I thought I could just buy some body building dietary supplements that do the individual amino acids. I thought I could sterilize them with a vacuum filter. 
How should I prepare the supplements? I assume there are other components such as salts in the pills- will I be able to separate that from amino acids? 

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