Don't try to make your own .. it has problems no matter what type of salt you use.
What I use:
In the First Aid section of the pharmacy, pick up some .9% Saline (Wound Wash/Flush).
It's used to clean out open wounds .. safe for a baby.
It's pure sterile water with .9% saline solution, and comes in a spray can.
It comes out of the can in a stream that is easy to direct into a dripper bottle.
I add about 1 drop per 2ml. to my juice.
It brings out the flavor (just like salt does in cooking), ... it smooth's out the harshness (maybe the bitterness you pick up on), .. and blends the flavors together.
It works especially good with fruits and chocolates.
You will not taste any salt, as it's super mild.
It will "brighten" the flavor of the fruit, but I find it doesn't help banana
There is also a saline solution you spray/inhale up your nose ..but that's the wrong one.
It has added ingredients.
You want the one without anything in it except the .09 saline and water, that is used to clean wounds.
Have fun experimenting.
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Apple Cider Vinegar works (changes the PH) with the Tobacco's and "Darks"
Yep .. found in the kitchen .. some like the "White" instead of the Apple Cider.
You won't taste the cider or saline in the juice, but they make big changes, and are great additives to experiment with.
You can also add a drop or two per 3ml of a tobacco.
Use one that is super mild like: Smooth, ..7 leaves,.. or Liquid Gold
It will give the juice "body", and brings the flavors together .. you won't taste the tobacco either.
Just mix up some small 2ml tests (with your juice) and compare them to each other, to see which one you like the best.
Have fun in the "science lab"