Hi everyone. I have a well with a whole house water softener. I use jugs of store bought spring water for my 5 gal betta tank. The problem is that the store doesn’t always carry the same brand I use and even with the same brand the pH and hardness can vary. I would like to know if using purified or distilled water with adding minerals back is okay? If so what brand of mineral additive would be best? I’ve seen seachem products online. It’s like playing mad scientist with spring water to get it right.