3 dr. hulda's liver flush questions

"9:45 PM. Pour 1/2 (half) cup (measured) olive oil into the pint jar. Add 2 drops HCl to sterilize. Wash grapefruit twice in hot water and dry; squeeze by hand into the measuring cup. Remove pulp with fork. You should have at least 1/2 (half) cup, more (up to 3/4 (three fourths) cup) is best. You may use part lemonade. Add this to the olive oil. Also add Black-Walnut Tincture. Close the jar tightly with the lid and shake hard until watery (only fresh grapefruit juice does this). "

how much Black-Walnut tincture should be added?
what is HCl? (is it just bleach?)
do you have to eat a low fat breakfast or can you just fast?