High sodium / dissolved solids

So, just got my water report back from Ward Labs, and a few numbers jumped out at me:

Total dissolved solids: 524 ppm
Sodium: 159 ppm
Sulfate (SO4-S): 26 ppm
Chloride: 150 ppm
Total alkalinity (CaCO3): 84 ppm

So, with as much as I'll need to dilute this stuff, am I better off just buying spring water or RO for brewing?

As explanation, the place I'm brewing now has a plumbed-in water softener, even on the outside taps.

Wow. High sodium and high dissolved solids. But can you get to the unsoftened water, and get a report on that?