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So... I can buy pre-mixed liquid that isn't dangerously concentrated, add flavor, and I can get 100+mL for the same price I pay for 30mL mixed???
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Once you have Working Recipes, yeah, that's about what it is.
Just do yourself a favor and keep Detailed and Accurate Records of EVERYTHING you do to a Recipe.
A Huge Mistake for Newbie DIY-ers is to think they can just add a couple of Drops of this and a Glug of that and some how remember what they did a Week Later.