Yes! My goodness... Those are the best!
You're right, it is cheaper.
At work (where I drink most of my water) there are water filtration stations that are a fancy RO system. The water comes out really, really pure. Months and months ago I realized that was not good, so I've been adding mineral supplements to the water. Looking at the label of the brand I'm currently using, there's hardly any potassium in it at all. (it's focused on other minerals) I might switch back to the brand I was using previously. It tasted better, anyway. ๐
I will eventually figure this out.