disclaimer: I realize this is way overkill for a simple cup of coffee, but I do enjoy nerding out and squeezing every little bit I can to get the best possible results

So I have been using the Barista Hustle water recipes using deionized water, Epsom salt (magnesium sulfate), and baking soda (sodium bicarbonate). The results have been really good compared to Brita filtered tap water. However I have read there are benefits to adding a little bit of calcium in the mix too, but not too much, according to Johnathan Gagne. I have ordered some anhydrous Calcium Chloride and would like to make a similar concentrate to the ones Barista Hustle has on their website, but I can’t really find any information on how much of the Calcium Chloride to mix in with 1000ml deionized water to get a 1000ppm solution. Does anyone have any insight, or might have figured this out already?