Happy Birthday ICMag! Been 20 years since Gypsy Nirvana created the forum! We are celebrating with a 4/20 Giveaway and by launching a new Patreon tier called "420club".
You can read more here.
Important notice: ICMag's T.O.U. has been updated. Please review it here.
For your convenience, it is also available in the main forum menu, under 'Quick Links"!
Lactobacillus Serum, is pretty much what you are looking for. You can web search a diy version, on how to make it at home. If you do some research you can find loads of info on making homemade nutrients.