jaggederest • today at 4:45 PM

I buy raw food grade minerals - calcium carbonate, magnesium carbonate, plus salt, lite salt, epsom salt, baking soda.

I make about a 40x concentrate (500ml makes 20 liters), I put about 15-20ml in an ~800ml bottle. Make sure you shake it vigorously immediately before use, like literally shake right until you pop the cap off and pour it, or you'll get weak water early and strong water later (it won't dissolve)

Recipe is something in this ballpark, no need to be especially precious about it, you won't taste minor variation:

    35g CaCO3
    15g MgCO3
    15g NaHCO3
    2g Epsom Salt (MgSO4+7H2O)
    1g Salt (NaCl)
    1g Lite Salt (NaCl + KCl)

You have to carbonate it very hard using something like a soda stream or a CO2 regulator, need it to go well beyond drinkably fizzy to dissolve the minerals (mostly calcium carbonate)

It's better to use as cold water as you can get, carbonates are inversely soluble in water based on temperature, so just above freezing (~2C or ~35F), and it'll hold more carbonation.