FSG questions.

I am thinking of trying to make FSG, but have a few questions...
What is a good ratio of flaxseeds to water? When I looked online it seems all over the place.
What can I add for hold? Agave? How much? Anything else?
What can I add for a preservative? How much? Where do I find it?
Anyone try the method where you leave the flaxseeds in a nylon bag while boiling? I saw it here Benefits Of Flaxseed Gel For Holding Curls, Waves & Kinks - Blog
It is toward the middle/bottom of the page; the no stir method. Would a nylon stocking work?
Thank you!
2a/b, med/high porosity, high density, fine texture