Lye from soap to bio fuel to Crystal meth, LYE (KOH, potassium hydroxide) Has a 1001 uses. And it is soooooo easy to make you could almost do it by accident !
Here's what you need
3 PLASTIC BUCKETS
Step 1: Step One: Apply Fire to Wood
First thing you need to do is burn some wood, No pine only hardwoods, Apple and fruit trees is the best.
Now after burning that wood collect the ashes in a big 5 gal plastic bucket make sure the coal are not hot and melt through the bucket.
Fill the bucket about half way should be enough.