Well, I have no idea if there has been a post of this, or if this thread goes here, so I figured I would give it a shot.
~ One 2 liter bottle of soda - cleaned, of course
~ About 20 IAL (Indian Almond Leaves)
~ Cooking pot that can hold at least 12 cups of water
~ Time - it takes a while! About 5hr and 3min total, so be sure to devote an afternoon to this!
Put the pot, with about 10-12 cups of water on the stove top. You do not need to use a pot this big, I used one to start, but my mom needed to make something, and took it from me haha. I just used a smaller pot and added water in as it evaporated. Wash the IAL in warm water, to get them damp. Put all of them into the pot, and set it on high.
Bring the IAL and water mixture to a boil, then turn it down to a medium heat, about 4-6 if you have numbers as heat settings. Let it go into a gentle boil until it is a deep amber color. Then bring it back to a rolling boil until it is a DARK brown. I used a wooden spoon to check when it was done. I stuck the end of the spoon to the bottom of the pot, and when I couldn't see it, I knew it was done. Or when it is the color of Dr. Pepper, Coca Cola, ect..
Take it off of the heat, and LET IT COOL! If it is still hot, the plastic bottle will morph and melt, and you will get a deformed mess! When it is cool, pour the black water Extract into the 2 liter bottle. It should end up being about the whole 2 liters, or 7-7.5 cups. Wait til it is cool, and divide it out to your finned friends! :D
I recommend keeping it in your fridge, to keep it fresh. Be sure to label it, so no one drinks it, because we don't want all of our hard work going to waste! Plus, I heard it tastes REALLY bad... haha
I hope this was some help, as I could not find a guide to making this anywhere. Please let me know what you think! I can upload pics, but I cannot find my camera cord right now, so y'all will have to wait til later hehe.