I’ve been using tap water to rehydrate dry yeast…which may have been run through a softener…do you guys think this water affects the overall taste of the beer?
No.
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Don’t tease me.
Sometimes. 
Thats better…in what circumstances?
Depends.
Ok ok ok… seriously. You’ll be fine with a couple cups of tap water, as long as there aren’t huge amounts of chloramine. But if it’s been through a filter, probably ok. Even if it’s not… how much water are you using to rehydrate? I usually use about 4-6 oz. And as is often said… the solution to pollution (including rehydration) is dillusion.
4 oz…and wouldnt that be dilution 
Been sampling. 
99 bottles of beer on the wall, 99 bottles of beer… take some down, pass them around… not as many beers on the wall!! Sneezles61
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Now I know why your beer tastes salty.
Seriously though…I’d be more concerned about the salinity affecting the yeast health. I doubut it’s an issue if you’ve been getting good results but somthing to consider.
As far as flavor impact on 5 gallons of beer…have you been into the hard stuff tonight…or are you in one of those hippy states?
Did I miss that somewhere that you should rehydrate dry yeast? ? I thought dry yeast could just be tossed in.
What?! I have to get a conductivity meter now?!
I find rehydrating the dry yeast produces better beer than when I’ve tried to dry out the liquid yeast.
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My thoughts are: Stop bothering to rehydrate. The small amount of softened water won’t hurt anything if you do. If you are still concerned buy a gallon of spring water at the store.
One home we owned had well water with a lot of iron in it. Didn’t taste good and left rust stains on the fixtures so I installed a softener. I usually bypassed the softener for brewing but depending on the style sometimes mixed it 50/50. Back then I was kind of winging it on water but the beer turned out fine.
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