It certainly is addicting, I am a full blown addict, and admit it. The gang in here has had a big influence on it. And I am thankful to them for it.
When using concentrate 3 cans to make a gallon is a good general rule.
Then of course, add the amount of sugar needed to bring it up to the SG you want.
As a general practice, this is what I do. It may not be correct but it has been working.
For 4 gallons, I add 3 tsp pectin enzyme and allow it to sit for 12 hours.
I add: 2 tsp yeast nutrient, 1/4 tsp Tannin, and 1/4 tsp Acid blend, and 1/4 tsp potassium metabisulphite and allow it to sit for 12 more hours. I then pitch the yeast (I have found Cotes de Blanc to be my yeast of choice), but yeast is a subject all on it's own, and one frankly I am not that familiar with.
I always ferment in a bucket with a cloth covering it and rack it to the secondary around 1.010.
Others may chime in and offer a more "qualified way", but I have made quite a few batches using concentrate using the above method and it has always worked.
Speaking of MD 2020, I like it when apple cider comes on sale, add enough sugar to get it up there around 18% PA, I use champagne yeast. This wine is definitely not a before, nor is it an after dinner wine!!LOL But it will get you whistling a happy tune.
Let us know how it turns out.
Troy