Deezil has it the wrong way round I understand.
Honey, water and yeast are "show" meads.
Honey, water, yeast and nutrients are considered "traditional" meads.
There are the 2 base methods i.e. pile all the honey for a desired outcome and then manage the issues as they arise - more of a beer making type technique, and the more wine making type approach where you would start at a defined gravity where the must replicates a grape must in sugar levels and then ferment it, using different yeasts to get different characteristics (sorry, I know this isn't the best of explanations)....
So, the first idea/approach, is fine when working with lower gravity start levels like beers, because they already contain non-fermentable sugars, so that when the ferment is finished, all of the fermentable sugars have been converted, but there's the underlying sweetness from the unfermentables, which shows up in the FG.
Meads aren't like that, because the start point is so much higher, yet as we know the sugars in honey are almost completely fermentable, non-fermentables making up only a tiny percentage. Hence if you wanted something of higher strength, the start gravity can be so high, as to cause problems, even as bad as osmotic shock, to the yeast, stalling or even preventing it from starting - plus some yeasts are more hardy/capable than others, so to my way of thinking, this is poor practice (which I often see over at homebrewtalk, I suspect, because of the higher numbers of people who are beer makers first and presume that you can just use the same method/technique with meads - you can, but it's much more limiting).
So, the other method which is more wine like, seems, to my way of thinking, to offer much more flexibility.
If you start, say, with 3lb of honey and make it up to 1 gallon of must (it doesn't really matter whether it's 1 US or 1 Imp gallon either, you'd just get a slightly lower gravity reading from the Imp gallon due to it's greater volume), then once the batch is fermenting, you can easily work out what the likely final strength will be from various, pretty basic, conversion charts. Because sugar of a known value, will convert to alcohol with quite a precise strength (obviously it depends on a few other factors too, but this is just using a basic example/demonstration).
Like a batch started at 1.133 OG, will, with care/correct management, finish at the presumed 1.000 level and that converts directly to 18.07% ABV. Obviously the differences between sugar containing liquid and the differences in density between alcohol hand water could provide some odd variations (hence my understanding of why the "attenuation" thing used by beer makers is useless when working out the numbers for meads).
So with something like a start gravity of 1.100, the presumed finish at 1.000 and the 100 point drop equates to 13.58% ABV, but if the ferment finished at 0.990, then it would be at 14.94% ABV.
Or when you've taken the SG to get the numbers above, if you've used a yeast that will go to 18% ABV, you have the choice of fermenting dry, then stabilising and back sweetening, or step feeding so that you get a stronger brew or even step feed it too death so that you know that you've had a total drop of however many points would equate to the tolerance of the yeast, plus some residual sugars to make the finished brew taste sweeter.
Obviously if you want carbonation, it's either got to finish with enough alcohol tolerance to be able to "bottle prime" (whether you just add extra fermentables or do the full "methode champenoise" route), or you have to think about forced carbonation and kegging.
This is basically why I suggest to people not to start too high, because that way, you have a greater choice of how you might want it too finish, or to be able to finish it........
Of course, how "easy" the ferment is, is likely to depend on the recipe, nutrients, acid/pH levels and a few other factors.
Equally, it's why it's easy to say, that IT IS easy, to make mediocre meads, but not so easy to make good/exceptional meads (yes, I know, the overly frequent use of the "E" word in the last sentence
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