Subject: How much caffeine do I give a spider to see results in its web

I am trying to set up an experiment to see if certain chemicals 
effect orb weaving spiders and the looks of the webs that they 
make after taking that chemical.  I plan to use four different 
spiders of the same kind, put them each in separate cages, and 
give them each a dose of their own chemical.  I will give Spider 
A some No Doze (or caffeine), Spider B gets alcohol, Spider C 
gets a muscle relaxer, and Spider D gets a pain killer like 
Tylenol.  My question is, " How much of each can I give the 
spiders to get good results but not give them so much that it 
kills them?"  Thank you very much for y

Re: How much caffeine do I give a spider to see results in its web