Yes, Mercola is a quack scaremonger like so many other "practitioners" out there. I used to get his emails but quickly unsubscribed after getting so many "XYZ will kill you!" letters. Keeping people paranoid and confused so they will buy his products. Shame on him. I Can't believe they told you to "just add water". Another example of these soulless jerks taking advantage of the sick.
I am always in agreement that getting ones vitamins from food rather than synthetic supplements is the way to go. I would just like to add though that MANY folks with AF suffer with Histamine Intolerance (some know it and some do not), so the lemon method would be detrimental in this case. But if one does not have this issue then lemon up!