You really do have to play with that calculator. It's got about 16 variables, so algorithmicly finding the optimum is computationally hard. Easy enough if you just play with em.
Any homebrew supply sells brewing salts. Usually, they sell gypsum, calcium carbonate, calcium chloride, epsom salt, and chalk. Just get table salt or baking soda at the grocery store. I have 1 ~150g vial of each that I keep with my brew scale, hydrometer, etc.
If I need to acidify my mash, I use tartaric acid, A.K.A. "Cream of tartar", from the baking isle at the grocery store. There's a button in that same calculator to tell you how much.
Any homebrew supply sells brewing salts. Usually, they sell gypsum, calcium carbonate, calcium chloride, epsom salt, and chalk. Just get table salt or baking soda at the grocery store. I have 1 ~150g vial of each that I keep with my brew scale, hydrometer, etc.
If I need to acidify my mash, I use tartaric acid, A.K.A. "Cream of tartar", from the baking isle at the grocery store. There's a button in that same calculator to tell you how much.