I have just made another batch of WTA liquid, using an adaptation of this method. Done well - and with patience - it certainly works and provides a juice that reaches parts other juices can't (with apologies to Carlsberg).
Firstly I invested in a very cheap booklet of Ph level papers. This has been a huge help in getting the various stages right.
PREPARE
1) I boiled up 25g of ground rolling tobacco in about 250ml of water and 2 teaspoons of sodium carbonate. After 10 minutes simmering, I cooled the mix and filtered it through some cotton cloth. This was easy as the mix was creamy in consistency.
2) I returned the filtered liquid to the pan and reduced it further... till it began to stiffen. I diluted this a bit with fresh water and - using a Ph paper - made sure it tested blue (alkaline) before pouring the mix (about 25ml) in a glass jar.
SEPARATE
3) To the water solution I added a similar amount of olive oil. I shook it and let separate three times over an 8 hour period.
3) I syringed off the oil into a clean bottle and added more oil to the old water solution - shaking and separating it twice over an hour. I then syringed off this oil adding it to the first lot. I discarded the water solution.
4) I took some fresh (ie distilled) water mixed with a few drops of white vinegar to about 20ml and tested to ensure its acidity (paper turns red). I then added this to the oil and shook.
5) After several shakings over 3 hours, I drew off the water solution with the syringe. I placed 10ml more of the water/vinegar solution into the old oil and repeated the process - adding the (now, lighter-coloured) water to the first amount. I discarded the old oil.
6) I then tested the water solution with a Ph paper and it showed a reduced acidity. I added a couple of small pinches of sodium carbonate to the water until it tested blue (alkaline) before mixing in with an equal amount of fresh olive oil and repeated the shaking/settling routine over a few hours. I drew off the oil into a clean bottle. I placed about 10ml of fresh oil into the old water solution and repeated the shake/separate routine several times before drawing off this oil and adding it to the first amount. I discarded the old water solution.
7) I repeated steps 4 to 5. I ended up with about 12 ml of light, strawberry blonde water solution. It wasn't crystal clear... but not far off!
REDUCE
I tested the solution with a Ph paper and added a few grains of sodium carbonate to equalise it. I placed the solution into a small stainless steel pot (a tiny milk jug) and reduced it down over a flame to about 3 - 4ml. By this stage I was wearing rubber gloves! I bottled this.
I added about four drops to about 7ml of 24mg commercial juice and vaped. I can feel it works very well. The effect is completely different to the commercial juice alone.
This may sound complicated, but it's not. I'm trying to work out a simple way of remembering the routines - like a short rhyme or something.